Learning how to live to 100 through supplements, lifestyle strategies, and evidence-based habits is becoming increasingly important as centenarian populations continue to grow. In 2021, the U.S. had 89,739 people aged 100 or older, making up about 0.027% of the population. Many of these individuals reach 100 without major chronic diseases or cognitive decline. For those over 55, understanding what percentage of people live to 100 and exploring how centenarians maintain their health can offer valuable, practical insights. This article explores live to 100 supplements lifestyle approaches, including findings from centenarian research, Blue Zones studies, and longevity genetics, alongside interventions that combine nutrition, movement, supplementation, and daily habits to support healthy ageing.
What Centenarians Are and Why They Matter for Over 55s
What percentage of people live to 100
The number of centenarians worldwide rose from 151,000 in 2000 to 573,000 in 2021 [1]. This growth pattern continues across developed nations. Census Day in 2021 recorded 13,924 centenarians living in England and Wales, a 24.5% increase from 2011 and the highest number ever recorded in an England and Wales census [2]. The number has risen from 110 since 1921, representing a 127-fold increase [2].
Projections suggest 19.6% of females and 14.1% of males born in 2021 can expect to live to become centenarians [2]. Life expectancy at the time of birth of 2021's centenarians in 1921 was 67.9 years for females and 61.2 years for males [2]. This cohort outlived their life expectancy by an average of 32 years for females and 39 years for males [2].
The United States shows similar patterns. According to 2018 CDC period life tables, 2.5% of white girls and 0.9% of white boys at birth will live to 100 [1]. The figures are 3.2% of girls and 1.1% of boys for Blacks, whilst Hispanics show the highest rates at 5.6% of girls and 2.2% of boys [1]. Gender differences remain pronounced. Women make up 85% of centenarians and men 15% [1].
Why centenarians are healthier than expected
Centenarians demonstrate remarkable health profiles when you match them against younger age groups. A quarter of centenarians reported having good or very good health, whilst almost a third were non-disabled [2]. More than 75% lived in rural areas [1], a pattern reflected in regions known for high concentrations of aged 100 populations.
The medication burden tells a compelling story. People who reach 100 took an average of 4.6 medications [1]. A large health register-based study in Spain found centenarians took an average of 4.9 medications, whilst non-centenarians in this study took 6.7 medications on average [1]. Centenarians appear to take fewer medications. This may indicate better health with fewer medical conditions.
Sleep quality provides another health marker. Research reviews show 68% of centenarians were satisfied with their sleep quality [1]. Good sleep is associated with extended years of good health and reduced risks of chronic diseases [1]. Male centenarians were more likely to be non-disabled than females and were also more likely to report having good or very good health [2].
What studying 100-year olds teaches us about longevity
Research into 100-year olds reveals three distinct pathways to exceptional longevity. About 15% are "escapers" who have no demonstrable disease at age 100 years [1]. Around 43% are "delayers" who did not exhibit an age-related disease until age 80 years or later [1]. About 42% are "survivors" with demonstrable disease prior to the age of 80 years [1].
Centenarians delay disability towards the end of their very long lives, at an average age of 93 years [1]. This compression of disability matters more than disease avoidance. About 90% of all centenarians were still functioning independently at the average age of 93 years [3]. This pattern connects to NAD and longevity pathways that support cellular resilience directly.
People who reach 100 illustrate successful ageing and often experience fewer chronic diseases while maintaining independence in daily life well into their 90s [1]. Research shows modifiable factors account for more than 60% of successful ageing [1]. Studies looking at centenarians worldwide find they take roughly twice as many new brain cells in a key memory region as their peers [4]. Blood protein patterns in certain 100-year-olds look more like those of middle-aged adults [4].
The Georgia Centenarian Study found more than 70% of centenarians rated their health as 'good' or 'excellent' [5]. These findings suggest the biology of staying fit in body and mind may be nowhere near as rigid as most people over 50 have been led to believe [4]. Understanding these patterns provides a foundation to implement evidence-based strategies covered in the complete guide to energy and longevity after 55.
Key Findings From Major Centenarian Studies
The New England Centenarian Study: Genetics and personality factors
Three landmark research programmes provide the scientific foundation for understanding exceptional longevity. The New England Centenarian Study (NECS) has enrolled almost 4,000 centenarians plus siblings and offspring since 1994 [3]. This study tracks health changes, physical function and cognitive abilities each year while examining genetic factors and environmental influences [6].
The NECS revealed that exceptional longevity runs strongly in families [3]. Siblings of centenarians had between 8 and 17 times greater chances of living past 100 years compared to individuals from the same birth year cohort [3]. Researchers calculated the heritability of liability to longevity ranges between 0.33 for females and 0.48 for males using sex-specific sibling relative risk data [3].
Genetic analysis identified 281 genetic markers that predict exceptional longevity with remarkable accuracy. These markers are 61% accurate at predicting who reaches 100 years old. They're 73% accurate for those 102 or older and 85% accurate for those 105 or older [3]. It's worth mentioning that the prediction improves with older ages beyond 100, supporting the hypothesis that genetic influence increases with age [3].
Researchers can characterise ninety per cent of the 801 centenarians in the study by one of 27 genetic signatures [3]. These signatures associate with different predispositions. Some subgroups completely escape heart disease while others delay Alzheimer's disease until the last 5% of their very long lives [3]. The 281 markers point to at least 130 genes, many of which play roles in Alzheimer's, diabetes, heart disease, cancers and high blood pressure [3]. Centenarians carry just as many disease-associated genetic variants as the general population. This suggests their advantage comes from longevity-associated variants that protect against negative effects [3].
The Okinawa Centenarian Study: Diet and purpose
Dr. Makoto Suzuki started the Okinawa Centenarian Study in 1975. It stands as the world's longest continuously running study of centenarians [3]. The team has studied more than 1,000 aged 100 individuals to understand genetic and environmental lifestyle factors responsible for healthy ageing [3]. Okinawa shows a prevalence of 40-50 centenarians per 100,000 persons, compared to 10-20 per 100,000 in most industrialised countries [3].
Siblings of Okinawan centenarians demonstrate cumulative survival advantages. Female centenarian siblings have a 2.58-fold likelihood of reaching age 90 versus their birth cohorts. Male siblings show a 5.43-fold likelihood [3]. This indicates a strong familial component to longevity [3]. Genetic studies suggest Okinawans are a genetically distinct group with characteristics of a founder population. They show less genetic diversity and clustering of specific gene variants [3].
The traditional Okinawan diet consists of low-caloric density, plant-based foods such as sweet potatoes, green and yellow vegetables, soy products and fish [3]. Older Okinawans share several characteristics of the caloric restriction phenotype. These include short stature, low body mass index of 18 to 22 and high HDL levels [3]. They practise hara hachi bu, a cultural habit of eating until only 80% full [3].
Ikigai, the Japanese concept of purpose, appears prominently in Okinawan longevity [3]. One 102-year-old man's ikigai involved caring for two prize bulls daily. Others find purpose in family or faith [3]. This purpose-imbued existence gives aged 100 populations clear roles of responsibility and feelings of being needed [3]. These findings connect directly to NAD and longevity pathways that support cellular function.
Danish twin study: Why lifestyle outweighs genetics
Recent analysis of Scandinavian twin cohorts challenged previous estimates of longevity heritability. Historical twin studies showed heritability of only 20 to 25%. Some pedigree studies suggested as low as 6% [6]. A newer study, published in 2024 by Science, revised this estimate upward to about 50% by accounting for changing external causes of death [6].
Researchers used mathematical modelling and analyses of twin cohorts raised together and apart to correct for extrinsic mortality factors such as violence, accidents and infections [6]. Longevity appears to be about 50% heritable when these external causes are excluded. This is like many other complex human traits [6]. The study verified findings using populations in Denmark and the US [7].
About 50% of potential lifespan comes from genetic inheritance. The other 50% stems from environmental factors [7]. Exercise, nutrition, sleep, stress, pollution and infectious disease exposure all fall into this external category [7]. This means modifiable lifestyle factors account for half of longevity potential. They provide substantial chance for intervention through evidence-based approaches to live to 100 supplements lifestyle strategies.
Blue Zones: Where People Live Longest
Image Source: Medium
The five Blue Zone locations around the world
Dan Buettner worked with National Geographic and the National Institute on Ageing to identify five geographically defined areas where people reach age 100 at rates ten times greater than in the United States [3]. Epidemiological data, statistics and birth certificates revealed these regions [3].
The Barbagia region of Sardinia contains the world's highest concentration of male centenarians [7]. Shepherds in these mountainous highlands walk five mountainous miles daily. This provides cardiovascular benefits while supporting muscle and bone metabolism [3]. The classic Sardinian diet consists of whole-grain bread, beans, garden vegetables and fruits, with meat reserved for Sundays and special occasions [3].
Okinawa hosts the world's longest-lived women, with females over 70 representing the longest-lived population [7]. The island shows a prevalence of 40 to 50 centenarians per 100,000 persons, compared to 10 to 20 per 100,000 in most industrialised countries [6]. Okinawans created moais, groups of five friends that commit to each other for life [3].
Ikaria demonstrates the world's lowest rates of middle-age mortality and dementia [7]. This Aegean island follows a Mediterranean diet rich in olive oil, fruits, vegetables, whole grains, beans, potatoes and herbal teas [8]. Middle-aged people who consumed about six tablespoons of olive oil daily seemed to cut the risk of dying in half [6]. Ikarians downshift with midafternoon breaks, and regular nappers have up to 35% lower chances of dying from heart disease [3].
The Nicoya Peninsula shows the world's lowest rates of middle-age mortality and the second highest concentration of male centenarians [7]. Nicoyans spend just 15% of what Americans do on healthcare yet are more than twice as likely to reach a healthy age of 90 years [3]. Their traditional diet centres on beans, corn tortillas and calcium-rich water that helps ward off heart disease [9].
Loma Linda, California stands as the only city among Blue Zones [10]. The Seventh-day Adventist community lives ten years longer than their North American counterparts [7]. They follow a vegetarian diet derived from biblical principles, based on nuts, legumes and leafy greens [11].
Nine common lifestyle factors in Blue Zones
Nine evidence-based lifestyle principles, termed the Power 9, appear in all five regions [3]. Natural movement dominates daily life through gardening, walking and manual labour rather than structured exercise [7]. Purpose, called ikigai in Okinawa and plan de vida in Nicoya, translates to "why I wake up in the morning" and is worth up to seven years of extra life expectancy [3].
Stress management routines include remembering ancestors in Okinawa, prayer among Adventists, naps in Ikaria and social hours in Sardinia [3]. The 80% rule, hara hachi bu, reminds Okinawans to stop eating when stomachs are 80% full [3]. Plant-based eating prevails, with meat consumed on average only five times per month in serving sizes of 3 to 4 ounces [3].
Moderate alcohol consumption, one to two glasses of red wine daily with food and friends, characterises four of the five zones [3]. All but one of the 263 centenarians interviewed belonged to faith-based communities, with attendance four times monthly adding 4 to 14 years of life expectancy [3]. Family commitment means keeping ageing parents nearby and investing in life partners and children [3]. Social circles support healthy behaviours, with research from the Framingham Studies showing that smoking, obesity, happiness and loneliness are contagious [3].
Blue Zone dietary patterns: Plant-based and calorie-conscious
A meta-analysis of 154 dietary surveys across all five Blue Zones found that 95% of aged 100 individuals eat plant-based diets [12]. Diets are 95 to 100% plant-based, featuring impressive varieties of garden vegetables, leafy greens, seasonal fruits, whole grains and beans [6]. Beans reign supreme as the life-blood of every longevity diet, with black beans in Nicoya, lentils and white beans in the Mediterranean, and soybeans in Okinawa [6].
Blue Zone residents eat at least four times as many beans as Americans do on average [6]. A half-cup of cooked beans daily provides most needed vitamins and minerals [6]. People in the blue zones eat sugar with intention, consuming only about a fifth as much added sugar as North Americans, no more than seven teaspoons daily [6].
Nuts feature prominently, with two handfuls daily. The Adventist Health Study 2 found that nut eaters outlive non-nut eaters by an average of two to three years [6]. The Okinawan practise of hara hachi bu exemplifies caloric restriction [6]. Blue Zone populations eat their smallest meal in the late afternoon or early evening, then consume nothing else the rest of the day [6].
Social bonds and multigenerational living in Blue Zones
Strong family ties and community connections reduce stress and promote emotional health while providing support systems that encourage healthy behaviours [8]. Multiple generations living together or in close connection prevents loneliness and keeps adults healthy and active as they age [8].
Elderly family members often live with younger generations in Okinawa, creating natural exchanges of knowledge and support [9]. Grandparents who look after their grandchildren have higher chances of living longer [6]. Proximity plays a role, with residents living in close-knit communities where homes, shops and public spaces sit within walking distance, encouraging spontaneous interactions [9].
These social dynamics curb isolation, which guides to adverse health outcomes [8]. The moai tradition in Okinawa provides secure social networks, lending financial and emotional support in times of need [3]. This interconnected approach to living creates the foundation for the NAD and longevity pathways that support healthy ageing.
The Genetics of Longevity: How Much Do Genes Matter?
FOXO3, APOE and longevity-associated gene variants
Genetic factors influence a person's longevity. Estimates suggest genetics accounts for around 25 to 40% of lifespan variation [13]. Two genes have emerged as the most consistently replicated in a variety of human populations for association with extreme old age: FOXO3 and APOE [14].
The FOXO3 gene encodes the transcription factor forkhead box O-3, positioned strategically in relation to intracellular pathways. The single nucleotide polymorphism rs2802292 showed the strongest association with longevity. Carriers of the protective G-allele have a 1.9-fold increased probability of living past 95 years compared to homozygote carriers of the non-protective T-allele [15]. Five FOXO3 SNPs retained statistically significant associations with longevity in meta-analysis. The G allele of rs2802292 shows an odds ratio of 1.54 in men [14].
Carriers of the longevity-associated G-allele expressed significant protection of telomeres cross-sectionally compared to people with the TT genotype [15]. G-allele carriers showed higher telomerase activity in older populations, which maintains telomere lengths during ageing [15]. Female G-allele carriers displayed decreased pro-inflammatory cytokine IL-6 levels. Male G-allele carriers showed greater increases in anti-inflammatory cytokine IL-10 during ageing [15].
The APOE gene emerged as a major genetic determinant, explaining 12 to 17% of mortality variation in people aged 65 and above [16]. Three polymorphic forms exist: ε2, ε3, and ε4. The ε4 allele associates with increased risk for Alzheimer's disease and age-related cognitive decline [8]. Carrying one copy of APOE4 raises Alzheimer's risk fourfold, and two copies increase risk 12-fold [11]. The ε2 allele benefits longevity. People with ε2ε2 or ε2ε3 genotypes have increased odds to reach extreme longevity compared to ε3ε3 [8].
Why genes account for only 25 per cent of longevity
Twin studies estimate that about 25% of variation in human longevity stems from genetic factors [17]. This heritability component increases linearly with age and proves more important in males than females [17]. The genetic component becomes important at ages beyond 100 years [18].
But each longevity-associated SNP has small effect sizes. They explain only a very small proportion of heritability for human longevity collectively [18]. More than 50 longevity-associated genetic loci of genome-wide significance have been identified through GWAS studies [18]. Recent research suggests rare variants may account for some of this missing heritability [18].
Scientists guess that lifestyle determines health and lifespan more strongly than genetics for the first seven or eight decades [17]. Eating well, avoiding tobacco and staying active enable people to attain healthy old age. Genetics plays a progressively important role as people age into their eighties and beyond [17].
Telomere length as a biological marker of healthy ageing
Telomeres protect chromosome ends from degradation, recombination and fusion. These structures shorten with each cell division and serve as a biological clock to determine cell and organism lifespan [10]. Telomere length decreases with age and may predict lifespan [7]. Human liver tissues lose 55 base pairs of telomeric DNA per year [7]. Telomere length in humans decreases at a rate of 24.8 to 27.7 base pairs annually [7].
Telomere dynamics predict survival and mortality better than chronological age in wild populations [10]. People with shorter telomeres have three-fold higher risk of developing myocardial infarction [7]. Shorter telomeres increase risk for lung, bladder, renal cell, gastrointestinal and head and neck cancers [7].
Yet the relationship remains complex. Long-lived animals show less rapid telomere shortening than short-lived ones [10]. Some studies report lack of telomere shortening with age or even increases in telomere length in organisms with exceptional longevity [10]. Telomere length remains one of the most commonly used biomarkers of ageing despite ongoing debates about whether it reflects biological state or influences biological conditions [10]. Understanding telomere dynamics connects directly to NAD and longevity pathways that support cellular resilience.
Biological Pathways That Drive Healthy Ageing
Image Source: Frontiers
Inflammageing: Chronic inflammation in over 55s
Chronic low-grade inflammation characterises most older individuals. Lifted levels of blood inflammatory markers carry high susceptibility to chronic morbidity, disability, frailty and premature death [12]. This pro-inflammatory state has high circulating levels of IL-6, IL-1, TNF and C-reactive protein [12]. The majority of older individuals show high levels of age-associated pro-inflammatory markers, even without risk factors and active diseases [12].
Cellular senescence accumulates with ageing in different organs and tissues. This contributes by a lot to organ damage [19]. Senescent cells secrete inflammatory factors known as the senescence-associated secretory phenotype (SASP). These factors promote chronic inflammation and induce senescence in normal cells [19]. Chronic inflammation accelerates immune cell senescence and results in weakened immune function. The immune system loses the knowing how to clear senescent cells and inflammatory factors, creating a vicious cycle [19].
Inflammageing patterns differ across populations. Inflammatory markers rose with age among Italian and Singaporean participants and linked to chronic diseases [20]. The inflammageing pattern was absent in Tsimane and Orang Asli populations with traditional lifestyles [20]. Chronic inflammation linked to ageing may arise from high-calorie diets, low physical activity and reduced infection exposure rather than inevitable biological processes [20].
NAD+ decline and how to support longevity pathways
NAD+ plays a pivotal role in cellular metabolism. It serves as a co-substrate for enzymes that affect cellular repair and longevity [21]. Accelerated ageing disorders and age-related disease states show low NAD+ levels that link to multiple hallmarks of ageing [21]. NAD+ concentrations can decline up to 80% due to increased PARP activity from DNA damage [22]. Low-grade chronic inflammation causes defects in NAMPT-mediated NAD+ biosynthesis and contributes to this decrease [22].
NAD+ serves as an exclusive co-substrate for sirtuins and poly(ADP-ribose) polymerases. These enzyme families regulate signalling processes associated with cellular health and longevity [21]. Restoration of NAD+ to youthful levels resulted in cardiovascular improvements and reversal of multiple metabolic conditions [21]. Muscle function and endurance improved together with increased mitochondrial function, ATP production and boosted muscle stem cells [21].
Caloric restriction increases NAD+ levels whilst lowering NADH levels and activating sirtuins [23]. Exercise and aerobic activity increase NAD+ through induction of skeletal muscle NAMPT expression [23]. NAD+ levels oscillate with a 24-hour rhythm and are modified by feeding and sleeping time. Darkness and night upregulate NAMPT activity [23].
Sirtuins: SIRT1, SIRT3 and SIRT6 activation
Sirtuins comprise a conserved family of NAD-dependent deacetylases and ADP-ribosyltransferases [6]. SIRT1 sits at the crossroads of nutrient sensing and adaptive pathways that regulate stress resistance and metabolism [6]. Studies in knockout animals showed SIRT1 absence causes metabolic derangements and infertility. Overexpression induces protective effects against metabolic and other stresses [6].
SIRT1, SIRT3 and SIRT6 inhibit inflammatory responses through NF-κB inactivation [24]. SIRT1 deacetylates the p65 subunit of NF-κB. SIRT3 exerts anti-inflammatory effects through acting on NLRP3 inflammasome and reduces ROS concentration and pro-inflammatory cytokine production [24]. SIRT1 boosts pancreatic beta cells' response to hyperglycaemia in insulin secretion [24]. SIRT1 promotes adiponectin production in white adipose tissue and prevents insulin resistance [24].
SIRT3, SIRT4 and SIRT5 are found in mitochondria. SIRT1, SIRT6 and SIRT7 are located in the nucleus [25]. SIRT1 binds to and activates PGC-1α through deacetylation. This affects gene expression, energy production and mitochondrial biogenesis [25]. SIRT3 is a major modulator of mitochondrial metabolism and homeostasis that regulates mitochondrial biogenesis, mitophagy and antioxidant expression [9].
Caloric restriction and intermittent fasting benefits
Caloric restriction represents the most resilient intervention in ageing research. It retards ageing and delays functional decline as well as disease onset in most organisms [6]. Research from the 1930s by Clive McCay showed caloric restriction's effectiveness in extending rat lifespan [6]. Sustained reductions in caloric intake can increase maximum lifespan across species [6].
The CALERIE Phase-2 randomised controlled trial randomised 220 healthy individuals to 25% calorie restriction or normal diet for two years [26]. The intervention slowed pace of ageing measured by DunedinPACE and represented a 2 to 3% slowing in pace of ageing [26]. This translates to a 10 to 15% reduction in mortality risk, as with smoking cessation interventions [26].
A dietary restriction study in diversity outbred mice found 40% CR mice achieved median lifespan around 36.3% greater than mice in the ad libitum group [27]. Intermittent fasting mice experienced extended median lifespan with minimal or no reduction in net caloric intake [27]. Feeding at specific times optimises benefits. Mice fed low-calorie diet at night lived longest [28]. Caloric restriction plus nighttime eating schedule extended life by 35% in mice and added nine months to typical two-year median lifespan [28].
Daily Habits of Centenarians: What They Do Differently
Low-intensity physical activity and walking
Centenarians accumulate three to five miles of walking each day through agricultural work and social travel rather than structured exercise [3]. Forty-two per cent walk or hike each week, with 7,000 steps per day linked to lower heart disease and cancer risk [29]. Movement happens through food preparation, gardening and floor-level living that maintains sit-to-stand capacity [3].
Purpose and meaning: Ikigai and plan de vida
Having ikigai reduces functional disability risk by 31% and dementia by 36% over three years [30]. Nicoyans maintain plan de vida, which provides clear roles and feelings of being needed [31]. Purpose-driven individuals experience lower stress and disease rates while living longer, happier lives [32].
Sleep quality and optimal sleep duration
Centenarians slept eight or more hours at age 70 yet showed no association between sleep patterns and health outcomes [33]. Seven hours proves optimal for cognitive performance and mental health in middle age and beyond [34]. Regular sleep-wake schedules associate with higher HDL cholesterol and lower triglycerides [35].
Stress management rituals and psychological resilience
Near-centenarians use acceptance most often as a coping strategy. They react with low anxiety intensity to stressful conditions [15][36]. Physical labour metabolises cortisol through sustained bodily work [14]. Laughter and social gatherings provide structured stress release in long-lived communities [14].
Social connection and strong relationships
Social isolation increases mortality odds by 91% when multidimensional assessments are used [37]. This effect exceeds obesity and physical inactivity risks [37]. Nicoyan centenarians receive visits from neighbours often and live with multigenerational families, which provides support and belonging [31].
Gut microbiome diversity in aged 100 populations
Centenarians show higher microbial diversity than younger adults, with enrichment of Akkermansia, Lactobacillus and butyrate-producing species [38]. They produce unique secondary bile acids, including isoalloLCA, which inhibits antibiotic-resistant Clostridioides difficile [39]. This distinct microbiome contributes to infection resistance and supports healthy ageing [40].
Live To 100 Supplements Lifestyle
The Mediterranean diet and PREDIMED trial findings
The PREDIMED trial enrolled 7,447 participants aged 55 to 80 years at high cardiovascular risk across 11 Spanish sites [8]. Participants assigned to a Mediterranean diet supplemented with extra-virgin olive oil showed a 31% reduction in major cardiovascular events after a median follow-up of 4.8 years. Those supplemented with nuts experienced a 28% reduction compared to the control diet [8]. A Harvard-led analysis tracking 25,315 women found those who followed a Mediterranean diet closely were up to 23% less likely to die during a 25-year follow-up period [11]. The PREDIMED study reported benefits for preventing cognitive decline and breast cancer beyond cardiovascular protection [41].
Key longevity supplements: NMN, resveratrol, spermidine and omega-3
NMN supplementation can reinstate NAD+ levels through biosynthesis pathways [16]. Studies in humans found doses between 250mg and 1,200mg daily are safe to consume. One trial showed 250mg daily for 10 weeks increased insulin sensitivity in postmenopausal people with prediabetes [42]. Resveratrol activates SIRT1 and was reported to stimulate this pathway. It increases DNA stability and extends yeast lifespan by 70% [43]. But resveratrol has low bioavailability in humans, which limits clinical potency [43].
Spermidine emerges as particularly promising. Fasting increases spermidine levels across species, from yeast to human volunteers [13]. The Bruneck Study followed 829 participants aged 45 to 84 years over 15 years and found those with higher spermidine intake showed around 40% reduced risk of fatal heart failure [18]. Spermidine supplementation increased median lifespan by approximately 10 to 15% in animal models. Effects were observed even when supplementation began later in life [18].
Evidence remains mixed for omega-3 fatty acids. A 2024 analysis with more than 117,000 participants from the UK Biobank showed that higher plasma DHA levels linked to lower risks of death from cardiovascular disease, cancer and all causes combined [44]. A three-year trial found omega-3 supplementation alone reduced PhenoAge, GrimAge2 and DunedinPACE markers. Combined intervention reduced biological ageing by an estimated 2.9 to 3.8 months [45]. An Interventions Testing Programme study using genetically heterogeneous mice found fish oil supplementation at either low or high dosages had no effect on lifespan of male or female mice, though [46].
Rapamycin and metformin: Pharmaceutical options
Rapamycin administration initiated in mid-life extends lifespan by 9% to 14% in mice and associates with delayed onset of age-related pathologies [47]. Rapamycin eliminates hyperimmunity rather than suppresses immunity at anti-ageing doses, and this allows it to act as an immunostimulator [48]. The PEARL trial showed that low-dose intermittent rapamycin was well tolerated over one year and resulted in modest changes in biomarkers of biological ageing [47]. Rapamycin and its analogue everolimus are FDA approved for human use and have been used safely for decades [48].
Metformin affects several ageing-related processes and may influence metabolic and cellular processes associated with age-related conditions [17]. The Targeting Ageing with Metformin (TAME) Trial will involve over 3,000 people between ages 65 to 79 across 14 research institutions to test whether metformin delays development or progression of age-related chronic diseases [17]. A multi-institutional study found metformin use associated with a 30% lower risk of death before age 90 compared to use of sulfonylurea [49]. Metformin improves insulin sensitivity and promotes cellular repair. It exhibits anti-inflammatory and antioxidant properties [50].
Hormesis: Exercise, fasting, cold exposure and sauna
Hormesis describes situations where mild stress produces net gains in function by spurring lasting increases in maintenance, repair and defensive activities [51]. Caloric restriction and intermittent fasting prolong lifespan and healthspan of model organisms and improve human health [13]. Spermidine levels increased upon distinct regimens of fasting or caloric restriction in yeast, flies, mice and human volunteers [13]. Long-term therapeutic fasting with daily caloric intake of approximately 250 kcal for 7 to 13 days increased serum spermidine levels in human volunteers [13].
Cold exposure activates brown fat and stimulates longevity-associated molecules including adiponectin, SIRT1, FGF-21 and irisin [52]. Rats immersed in 23°C water for four hours daily, five days weekly, lived longer despite consuming more calories and weighing less than control rats [52]. Daily sauna sessions link with a 40% to 50% reduced risk of cardiovascular disease and all-cause mortality [53]. Repeated sauna use adjusts the body to heat and optimises the body's response to future exposures through hormesis [54]. Those over 55 seeking to implement these strategies can connect these interventions with customised approaches outlined in the complete guide to energy and longevity after 55. This provides a structured framework for longevity optimisation.
Your Practical Action Plan: How to Live to 100
Biological age testing and longevity tracking tools
DNA methylation tests estimate how quickly the body ages compared to peers. GrimAge and similar epigenetic clocks analyse blood samples to assess biological age [55]. But researchers emphasise these tests work best when combined with clinical variables like blood pressure and glucose metabolism [55]. Wearable devices track heart rate, sleep quality and activity patterns. They provide live health data [56]. Genetic testing identifies variants in FOXO3 and APOE. Epigenetic analysis reveals methylation patterns linked to lifespan [56]. Combining multiple biomarkers creates a more accurate health picture than any single test for those over 55 [57].
Environmental factors: Air quality and toxin avoidance
Air pollution shortens average lifespan by 1 year and 8 months currently [58]. Fine particulate matter (PM2.5) causes cardiovascular disease and respiratory conditions [59]. Environmental pollutants accelerate biological ageing. Cumulative loss reaches 5 to 10 years per person [60]. Cadmium, lead and cotinine link to faster epigenetic ageing [61]. Indoor air purification removes up to 99.97% of harmful particles [62]. Reducing exposure to toxins through air quality management proves essential for longevity optimisation based on these findings.
The truth about alcohol and longevity
Research shows mixed findings on alcohol consumption. The highest probability of reaching 90 occurred in those consuming 5 to 15 grammes daily. This corresponds to 0.5 to 1.5 glasses [63]. Wine intake associated with 43% higher chances of reaching 90 amongst women [63]. Heavy drinking shortened lifespan by 13 years [64]. Binge drinking showed inverse relationships with longevity [63]. Modest drinkers gained 0.94 years compared to non-drinkers. Regular drinkers lost 6.9 years [65]. To name just one example, moderate intake (one to two drinks daily) may offer cardiovascular benefits [66]. Yet no amount proves essential for health [67].
Combining diet, movement, sleep and supplements
Small daily improvements yield substantial longevity gains. Research found that combining 15 additional minutes of sleep, 1.6 minutes of moderate activity and 1 to 2 vegetable servings linked to 10% lower death risk [68]. Larger changes produced greater benefits. Seventy-five minutes more sleep, 12.5 minutes of movement and dietary improvements associated with 50% lower mortality risk [68]. The greatest gains (9.35 years) came from 42 to 103 minutes of exercise and seven to eight hours of sleep. Consuming fish, whole grains and vegetables contributed as well [10]. So interventions across multiple behaviours reduce the change required for any single behaviour [10].
Working with medical guidance for your longevity strategy
Longevity medicine extends both lifespan and healthspan through evidence-based interventions. These address cellular and molecular ageing [69]. Physicians analyse genetic data and biomarker profiles to create individual-specific nutrition and exercise protocols. Continuous monitoring helps with stress management [69]. Baseline health status gets established through full evaluation and complete testing during original consultations [7]. Quarterly reviews track progress and adjust recommendations based on biomarker changes [7]. This approach shifts healthcare from reactive treatment to proactive monitoring. It identifies early changes in ageing-related biomarkers [57]. Working with medical professionals ensures safe implementation of strategies for those seeking to optimise energy and longevity after 55.
Conclusion
The path to exceptional longevity combines evidence-based science with daily habits practised by centenarians worldwide. Genetics account for only 25% of lifespan potential. This leaves room for lifestyle interventions. Implementing live to 100 supplements lifestyle strategies produces measurable results within months for those over 55. These strategies focus on nutrition, movement and social connection. The science demonstrates that biological age remains modifiable through targeted interventions, from Mediterranean dietary patterns to NAD+ optimisation and hormetic stress. Consistency matters more than perfection. Small improvements yield the greatest longevity gains when applied to multiple behaviours. Medical guidance ensures safe implementation while biological age testing tracks progress along the trip.
Key Takeaways
Research reveals that reaching 100 is more achievable than previously thought, with lifestyle factors accounting for 75% of longevity potential whilst genetics contribute only 25%.
• Centenarians delay disability until age 93 on average, with 90% maintaining independence well into their nineties through consistent daily habits.
• Blue Zone populations achieve ten times higher centenarian rates through plant-based diets, natural movement, strong social bonds, and purposeful living.
• NAD+ decline accelerates ageing, but caloric restriction, exercise, and targeted supplements can restore cellular function and extend healthspan significantly.
• Combining Mediterranean diet patterns with 7-8 hours sleep, regular movement, and stress management reduces mortality risk by up to 50%.
• Biological age testing and medical guidance enable personalised longevity strategies, making the goal of living to 100 both measurable and attainable.
The most encouraging finding is that modest improvements across multiple lifestyle areas—adding 15 minutes of sleep, brief daily walks, and extra vegetables—can reduce death risk by 10%. For those over 55, the window for meaningful intervention remains wide open, with centenarian research providing a proven roadmap for extending both lifespan and quality of life.
FAQs
Q1. What foods do people who live to 100 eat most frequently? Centenarians predominantly consume plant-based foods including beans, nuts, whole grains, leafy greens, and seasonal vegetables. Beans appear in every longevity diet—black beans in Nicoya, lentils in the Mediterranean, and soybeans in Okinawa. They eat nuts daily (about two handfuls), use olive oil liberally, and consume meat sparingly, averaging only five times monthly in small portions. Their diets are 95-100% plant-based with minimal processed foods and added sugars.
Q2. What percentage of people actually reach 100 years old? Currently, about 0.027% of the population lives to 100, though this varies by region and demographics. For babies born in 2021, projections suggest 19.6% of females and 14.1% of males may reach centenarian status. The number of centenarians worldwide has grown significantly, rising from 151,000 in 2000 to 573,000 in 2021, with Blue Zone regions showing rates ten times higher than average populations.
Q3. How much does genetics influence longevity compared to lifestyle? Genetics account for approximately 25% of longevity potential, whilst lifestyle factors determine the remaining 75%. Twin studies and recent research confirm that modifiable behaviours—including diet, exercise, sleep, stress management, and social connections—play the dominant role in determining lifespan. This means individuals have substantial control over their ageing trajectory through daily choices, particularly when interventions begin after age 55.
Q4. What daily habits distinguish centenarians from others? Centenarians accumulate natural movement through walking, gardening, and daily tasks rather than structured exercise, averaging three to five miles daily. They maintain strong social connections, live with purpose (ikigai or plan de vida), sleep seven to eight hours nightly, and practise stress management through acceptance and community engagement. They eat until 80% full, consume predominantly plant-based diets, and maintain diverse gut microbiomes with beneficial bacteria.
Q5. Can you improve your health and longevity after 55? Absolutely. Research demonstrates that modest lifestyle improvements after 55 produce measurable benefits within months. Adding 15 minutes of sleep, brief daily walks, and extra vegetables reduces mortality risk by 10%, whilst larger changes across multiple behaviours can reduce risk by 50%. Centenarians delay disability until age 93 on average, proving that biological age remains modifiable through targeted interventions in nutrition, movement, sleep quality, and social engagement well into later life.
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