Men over 60 face a troubling cycle between stress and testosterone levels. Research shows that long-term stress substantially affects their hormone balance. Studies reveal that 20% of men in their 60s and more than 50% of men in their 80s have subnormal serum testosterone levels. Their hormone levels change while mean daily serum cortisol levels rise in elderly years. This creates an unhealthy imbalance.
Age makes the relationship between cortisol and testosterone more crucial. Stress triggers cortisol production to handle short-term challenges, but long-term exposure creates health problems. These include digestive issues, weight gain, and poor sleep. Stress directly reduces testosterone levels. This creates a cycle where inactive lifestyle lowers testosterone and guides people toward depression, exhaustion, and weaker bones and muscles. Poor sleep quality plays a role too. Research shows that less sleep time leads to lower testosterone and higher afternoon cortisol levels.
Chronic stress's effect on male hormones after 60 matters because high cortisol levels and reduced axis sensitivity link to poor cognitive health, dementia, depression, and anxiety. The good news is that elderly people maintain their HPA function. This suggests that the right interventions could help restore their hormone balance.
Understanding the Cortisol–Testosterone Relationship: Stress and Testosterone Explained

Image Source: researchgate.net
The balance between cortisol and testosterone is like a delicate hormonal dance that becomes more complex as men age. These two powerful hormones work against each other in the male body. Their balance affects health outcomes dramatically, especially after age 60.
How cortisol and testosterone interact
Cortisol and testosterone serve as the main catabolic and anabolic signals in men, respectively [1]. Testosterone builds and maintains tissue, while cortisol breaks it down during stress responses. Many studies show these hormones often have an inverse relationship - when one goes up, the other tends to go down [2].
This relationship becomes clear during stress responses. Studies showed that pharmacological doses of cortisol can directly lower testosterone production [2]. To cite an instance, during physical exercise, cortisol increases to keep blood glucose levels stable by mobilising amino acids and lipids. At the same time, testosterone rises to support muscle growth and maintenance [2].
The adrenal gland makes both hormones through the same cascade of reactions [2]. This shared production pathway means that under stress, cortisol production takes over, but some testosterone might still be produced. The relationship between these hormones isn't always simple. While total testosterone may drop with high cortisol, free testosterone levels might actually rise due to binding protein affinity changes during exercise [2].
The dual-hormone hypothesis suggests that testosterone's effects on social behaviour depend on cortisol levels [2]. Testosterone's link to status-seeking behaviour is stronger when cortisol levels stay low but weakens when cortisol levels are high [2]. This has real-life implications. Executives with high testosterone and low cortisol tend to reach higher status positions than those with high levels of both hormones [2].
Why this balance matters more after 60
The cortisol-testosterone balance becomes crucial as men age. Poor sleep, common in older adults, lowers testosterone while raising late-afternoon and early-evening cortisol [1]. This hormone imbalance is a key way sleep loss causes insulin resistance, which becomes more common with age [1].
Studies showed that proper testosterone-cortisol balance alleviated the development of insulin resistance and hyperinsulinemia by at least 50% in people who didn't get enough sleep [1]. This matters a lot for ageing men because years of poor sleep lead to prediabetes and type 2 diabetes through similar hormone pathways [1].
The elevated cortisol-to-testosterone ratio often seen in older men associates with metabolic problems and might show chronic stress [1]. Severe stress in elderly people associates with a big increase in the cortisol/dehydroepiandrosterone (DHEA) ratio [3]. Regular aerobic exercise helps. People under high stress who didn't do aerobic training had much higher cortisol/DHEA ratios compared to regular exercisers [3].
The role of the HPA axis in hormone regulation
The hypothalamic-pituitary-adrenal (HPA) axis works as the body's main stress response system [4]. This complex neuroendocrine network links the hypothalamus, anterior pituitary, and adrenal cortex through coordinated hormone signals [4].
Stress triggers the HPA axis to start a chain of events. The hypothalamus releases corticotrophin-releasing hormone (CRH), which makes the anterior pituitary release adrenocorticotropic hormone (ACTH). This ended up stimulating the adrenal cortex to release cortisol [4]. Under normal conditions, cortisol tells the hypothalamus to stop making CRH through a negative feedback loop, which stops the stress response [4].
Chronic stress can throw off this delicate system and lead to HPA axis dysfunction and constant high cortisol levels [4]. This disruption raises the risk of many health conditions, from immune system problems and mental health issues to metabolic diseases and heart problems [4]. It also might contribute to memory loss and conditions like Alzheimer's disease, which already worry ageing men [4].
If you have stress-related testosterone issues, you might want to look into the links between sleep and testosterone or natural remedies for andropause.
How Chronic Stress Alters Hormone Levels in Older Men

Image Source: honehealth.com
Men's hormone system changes dramatically as they age, and chronic stress makes these changes even more intense. The relationship between stress and testosterone becomes crucial after 60. At this age, normal hormone changes interact with stress responses and create unique health challenges for older men.
Age-related changes in cortisol secretion
Most hormones decrease with age, but cortisol follows a different path in older men. Research shows mean cortisol concentrations actually increase with age. The pattern becomes irregular with a flatter daily profile [2]. This change leads to higher evening and night-time levels. The morning cortisol spike happens earlier but isn't as strong [2].
Research comparing different age groups shows cortisol levels go up 20–50% between ages 20–80 [2]. Night-time cortisol levels rise steadily with age in both men and women [2]. The peaks and quiet periods of cortisol release also become much smaller [2].
Scientists describe these changes as a "flatter" cortisol curve throughout the day. Older men have higher baseline cortisol but experience less dramatic ups and downs in their daily rhythm. These changes can substantially affect stress responses, sleep quality, and many body functions that rely on proper cortisol balance.
Decline in testosterone and DHEA with age
While cortisol rises with age, testosterone and its precursor dehydroepiandrosterone (DHEA) do the opposite. DHEA levels drop dramatically with age in men, eventually reaching only 10–20% of young adult levels [5]. This represents one of the biggest hormone changes in human ageing.
Testosterone-producing Leydig cells in the testes start to die off around ages 35 to 40 [5]. Men lose about 1–3% of their testosterone and up to 4% of their DHEA each year [5]. This isn't temporary but continues throughout life. Testosterone drops most noticeably between ages 40–44 and 55–59 [6]. Interestingly, testosterone hits its lowest point around age 58–59 and then increases slightly in later years [6].
By ages 70–80, DHEA sulphate (DHEAS) in men measures only about 20% of what it was before age 40 [2]. This major reduction, combined with steady or increased cortisol, creates what doctors call "adrenopause" - a state of low DHEA but normal cortisol [5].
Impact of long-term stress on hormonal feedback loops
Long-term stress disrupts the complex systems that control hormone production in older men. One major effect comes from damage to key proteins needed to make testosterone [7]. Stress also activates the hypothalamic-pituitary-adrenal (HPA) axis, which leads to higher cortisol and further reduces testosterone [8].
The body's ability to regulate the HPA axis weakens with age [2]. Studies prove this by showing older adults (65–99 years) barely reduce their adrenocorticotropic hormone (ACTH) in the first 15 minutes after getting hydrocortisone. Young adults (18–26 years) show a sharp drop during the same time [2]. Older men also tend to respond poorly to dexamethasone suppression tests [2].
The balance between cortisol and DHEA becomes crucial with age. This ratio keeps increasing [2]. Cortisol can damage nerve cells while DHEA protects them [2]. Chronic stress makes this worse by keeping cortisol high while pushing already low DHEA and testosterone even lower.
Men dealing with stress-related hormone imbalances might benefit from learning about the sleep-testosterone connection or natural remedies for male andropause to help manage these age-related challenges.
The Physical Effects of Hormonal Imbalance After 60
Image Source: Nature
Physical changes become noticeable in men over 60 due to hormonal imbalances. These changes can substantially affect their quality of life. The relationship between cortisol and testosterone gets worse with time. Multiple body systems show visible changes.
Muscle loss and frailty
Sarcopenia, the age-related loss of muscle mass and strength, affects men and women equally after age 60. The rates keep going up as people get older [9]. This condition affects the musculoskeletal system and plays a key role in making people more frail, prone to falls, and likely to suffer fractures [9].
Sarcopenia does more than just change how someone looks. Common symptoms include:
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Lower stamina
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Problems with daily activities
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Slower walking
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Difficulty with stairs
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Poor balance and higher risk of falling
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Smaller muscle size [9]
Research over time shows muscle mass, strength, and power start declining at about age 35. Strength and power decrease faster than muscle mass [4]. You can see this clearly in real-life performance—world weightlifting records drop by 30% among men between ages 30-60 years [4].
Sarcopenia links closely to reduced function and disability [4]. The right balance between testosterone and cortisol becomes vital. High stress raises cortisol levels while reducing testosterone production, which speeds up this decline.
Visceral fat and metabolic syndrome
Body fat usually increases with age, but not evenly throughout the body. Men in their later years have more than double the visceral fat compared to younger men. They only have 30% more upper body fat under the skin and no extra fat in their legs [10]. This uneven fat buildup creates serious health risks.
Visceral fat poses greater risks than fat under the skin for heart disease, insulin resistance, and type 2 diabetes [11]. The location of visceral fat creates a 'portal' effect that releases more free fatty acids and glycerol [11].
This pattern of fat distribution leads to metabolic syndrome—which includes belly fat, insulin resistance, and high blood pressure [12]. Visceral fat acts like an active organ by releasing substances that interfere with insulin's work [11].
Bone density and osteopenia
About 40 million Americans have osteopenia, which means reduced bone density [1]. This condition warns of possible osteoporosis, and both become more common as people age [1].
Bone density naturally decreases as men age, but stress and hormone problems make it worse. Low testosterone levels from stress contribute to bone loss. People don't notice osteopenia until they break a bone, often from minor injuries [1].
Hip fractures cause more deaths in men than women [3]. Men face twice the risk of dying in hospital after a hip fracture. Their one-year death rates range from 31-35% compared to 17-22% for women [3].
Immune system decline
The immune system gets weaker with age, a process called immunosenescence that happens alongside dropping hormone levels [13]. Older adults take longer to heal, get sick more easily, and have more inflammation.
Cortisol's effects on immunity become more important with age. Stress keeps cortisol high, which weakens the immune system even more. Lower levels of testosterone and DHEA remove their protective benefits for immunity [13].
These hormone changes lead to more inflammation markers in blood, fewer immune cells, and weaker natural killer cells [14]. Research shows that after menopause, women's inflammatory markers go up while their immune cells work less effectively due to hormone changes [14].
Men can take steps to help with these physical changes by learning about the sleep-testosterone connection or trying natural remedies for male andropause. They might also benefit from supplements like Ashwagandha and Magnesium to support hormone balance.
Cognitive and Emotional Impact of Cortisol Dominance

Image Source: Nature
The battle between cortisol and testosterone takes a toll on men's mental abilities and emotional health after 60. This hormonal imbalance affects the brain in ways that start small but grow more serious over time.
Memory and concentration issues
High cortisol levels hurt cognitive performance in older men, especially their memory and focus. Men with chronic high cortisol struggle to concentrate and show signs of memory loss and cognitive decline [15]. Their mental processing speed drops, which shows up in tests comparing morning cortisol levels to cognitive performance [2].
Cortisol's effect on memory is complex. It can make it harder to recall memories but helps form new ones [2]. This follows a U-shaped pattern - both very low and very high cortisol hurt performance, while moderate levels work best [16].
Working memory takes the biggest hit from cortisol changes. Research shows that giving hydrocortisone to healthy adults damaged their working memory but left other memory types intact [16]. This suggests working memory is more sensitive to cortisol shifts than other types of memory.
For men over 60, these problems get worse as age-related cortisol increases associate with worse memory performance [2]. Men who have high cortisol and certain genetic risk factors face cognitive decline that ages their brain by 8.0 to 12.7 years in areas like language, coordination, and decision-making [17].
Mood swings, anxiety, and depression
Cortisol's link to mood disorders becomes more critical after 60. About half of all new depression cases show too much cortisol production [5]. High cortisol often causes:
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Depression and apathy
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Anxiety and irritability
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Mood swings and emotional instability
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Reduced libido
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Difficulty concentrating [6]
Evening cortisol levels tell an important story. People with depression show higher levels at night, and these levels match how severe their symptoms are [5]. This happens because cortisol affects serotonin production - too much cortisol in the brain can lead to low serotonin by reducing available tryptophan [5].
Brain structure changes in the hippocampus and amygdala
High cortisol levels actually change the brain's physical structure. The hippocampus has many cortisol receptors, making it easy for high cortisol to damage it [5]. Long-term stress shrinks neurons and can kill them if it continues [5].
Advanced brain scans using PET and fMRI show smaller hippocampus, prefrontal cortex, and amygdala in people with depression and PTSD [5]. This damage creates a dangerous loop - as the hippocampus shrinks, it can't control cortisol production properly, which leads to even more cortisol [16].
Men who want to protect their brain health should look into the sleep-testosterone connection or try natural remedies for male andropause. They might also benefit from supplements like Ashwagandha and Magnesium that help balance stress hormones.
Breaking the Cycle: Stress Reduction Techniques for Seniors
Men over 60 need practical, research-backed techniques to break free from the stress-cortisol cycle. Several methods work especially when you have to regulate hormone balance and support overall wellbeing in seniors.
Mindfulness and breathing exercises
Older adults can utilise breathing techniques as a natural way to manage stress hormones. These exercises trigger the body's relaxation response and naturally lower stress hormone production while creating a sense of calm [18]. This connection between breathing and hormones makes these practises an excellent way to break the cortisol-testosterone cycle.
These breathing techniques have shown remarkable benefits:
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Diaphragmatic breathing: This method helps you breathe deeper from your abdomen. It strengthens breathing muscles and improves oxygen flow [19]
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Box breathing: First responders use this four-step process to stay calm under pressure. It helps control emotions and reduces chronic anxiety [19]
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Pursed-lip breathing: This technique helps during breathless moments by slowing breathing and keeping airways open longer [19]
Just five minutes a day can make a difference, and regular practise compounds these benefits for better stress hormone control [19].
Sleep hygiene and circadian rhythm support
Sleep plays a vital role in hormone balance. Research shows that less sleep relates to lower morning, afternoon and 24-hour testosterone levels and higher afternoon cortisol [20]. This hormone imbalance between growth and breakdown signals gets worse with age.
People aged 60-65 naturally start feeling sleepy earlier and wake up earlier [8]. They spend more time in light sleep instead of deep, restorative sleep, which leads to waking up three to four times each night [8].
These habits support healthy sleep:
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Keep consistent sleep and wake times
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Make your bedroom cool, dark, and quiet
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Stop using screens an hour before bed
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Skip large meals and drinks near bedtime
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Get morning sunlight through outdoor activities
Social connection and emotional resilience
Your hormone balance depends on more than personal habits. Strong social bonds lead to better health and longer life [21]. People who feel lonely have more inflammation, weaker immune systems, and higher stress hormones [link_2].
Good social support reduces cortisol and builds emotional strength. Research shows seniors with strong social circles have healthier hearts, lower blood pressure, and stronger immune systems [22]. These improvements come from the stability and motivation that close relationships provide.
Link: Sleep and testosterone connection
Men produce most of their daily testosterone during sleep [23]. Research confirms testosterone rises while sleeping and falls during waking hours, showing sleep's key role in hormone production [24]. Just one week of sleeping only 5 hours per night can drop testosterone by 10-15% - like ageing ten years [24].
Men dealing with stress-related hormone issues can learn about the sleep-testosterone connection, along with natural solutions like Ashwagandha, Magnesium, and other natural remedies for male andropause.
Natural Support for Hormonal Balance After 60
Men over 60 face complex hormonal changes. Natural treatments can help without the risks of medications. These solutions work together to address why testosterone levels drop due to stress.
Adaptogens like Ashwagandha and their effects
Adaptogens are special herbs that help your body fight different types of stress - physical, chemical, and biological. Ashwagandha (Withania somnifera) stands out as one of the best herbs to balance hormones in older men.
This Ayurvedic herb boosts testosterone production and lowers cortisol levels naturally. Research shows ashwagandha works by:
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Protecting cells that make testosterone from damage
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Boosting luteinizing hormone that triggers testosterone production
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Lowering oxidative stress that affects libido and sperm quality [25]
An eight-week study showed men who took ashwagandha extract had higher DHEA-S and testosterone levels [25]. The extract works through concentrated compounds called withanolides that regulate hormones in various ways [26].
Magnesium and testosterone regulation
Magnesium plays a vital role in testosterone production as men age. Men who took 450 mg of magnesium daily saw their testosterone levels jump by 24% in just four weeks [7]. Active men saw even better results, which makes exercise and magnesium a powerful combination.
This essential mineral helps in several ways:
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Reduces Sex Hormone-Binding Globulin (SHBG) to free up more testosterone
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Improves deep sleep when testosterone production peaks [27]
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Supports over 300 biochemical reactions including testosterone synthesis [7]
Research on 399 men aged 65 and older found a strong link between magnesium levels and total testosterone and IGF-1 levels [28]. This connection stayed strong even after considering factors like BMI, insulin levels, and other hormones [28].
Dietary and lifestyle changes
Your diet can help manage andropause symptoms naturally. These foods boost testosterone production:
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Zinc-rich foods (oysters, lean beef, oats)
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Magnesium sources (nuts, seeds, spinach, beans)
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Vitamin D (fatty fish, fortified milk) [29]
Your weight matters more than anything else. Each point you lose in BMI adds about one point to your testosterone levels [30]. You should also limit alcohol since it turns testosterone into oestrogen [30].
Exercise revolutionises hormone health by making hormone receptors more sensitive [9]. Both weight training and high-intensity intervals prevent insulin resistance and boost testosterone [9]. Even walking regularly can raise key hormone levels if you can't do intense workouts [9].
Link: Ashwagandha and testosterone
Link: Magnesium and testosterone
Link: Natural remedies for andropause
Conclusion
You can break free from the cortisol-testosterone imbalance at any age. Men over 60 face unique hormonal challenges. Their bodies make less testosterone but often keep or increase cortisol levels. This hormonal change triggers many physical and mental health problems. Understanding how these hormones work together is the first step to getting back in balance.
The physical effects of this imbalance show up as muscle loss, more belly fat, weaker bones, and a compromised immune system. The mental effects are just as worrying. Memory problems, mood swings, and actual changes in brain areas like the hippocampus and amygdala can occur. These hormones affect each other, so stress reduction helps in two ways - it lowers cortisol and helps boost testosterone production.
Mindfulness and proper breathing are available tools that help manage stress. They need no special equipment but deliver real benefits. Good sleep plays a crucial role too, and it's directly linked to testosterone production. Strong social bonds help hormone health and build emotional strength while fighting off stress from loneliness.
Specific adaptogens and minerals create another path to balance. Ashwagandha has shown great results in lowering cortisol while supporting testosterone. It works in several ways to protect hormone-producing cells. Magnesium supplements can boost testosterone levels and support hundreds of important body processes.
Diet and lifestyle changes are the foundation of hormone health. Weight control, good nutrition, and the right amount of physical activity all play their part. Men who want complete support can look into natural remedies for male andropause that target their specific symptoms.
Age brings hormone changes, but chronic stress speeds up this process unnecessarily. Men over 60 who understand the cortisol-testosterone connection can take steps to reduce stress effects. They can support natural hormone production and keep their physical and mental health strong longer than they might think. The body responds well to positive changes even after years of imbalance. It's never too late to start taking care of your hormonal health.
Key Takeaways
Understanding the stress-hormone cycle after 60 empowers men to take targeted action against age-related hormonal decline and its cascading health effects.
• Chronic stress creates a vicious cycle where elevated cortisol suppresses testosterone production, accelerating muscle loss, cognitive decline, and metabolic dysfunction in men over 60.
• Quality sleep directly impacts hormone balance—sleep restriction reduces testosterone by 10-15% whilst increasing cortisol, making proper sleep hygiene essential for hormonal health.
• Natural interventions like ashwagandha and magnesium supplementation can significantly boost testosterone levels (up to 24% increase) whilst reducing stress hormones through multiple biological pathways.
• Mindfulness practises, breathing exercises, and social connections provide accessible stress-reduction tools that help break the cortisol-testosterone imbalance without pharmaceutical intervention.
• Weight management and regular physical activity remain the most powerful lifestyle interventions, with every BMI point reduction correlating to measurable testosterone increases.
The key to successful hormonal rebalancing lies in addressing multiple factors simultaneously—combining stress reduction techniques with targeted nutrition, quality sleep, and appropriate supplementation creates synergistic effects that can restore vitality even after decades of imbalance.
FAQs
Q1. How can men over 60 naturally boost their testosterone levels? Regular exercise, particularly a combination of aerobic and resistance training, can help increase testosterone production in older men. Additionally, maintaining a healthy weight, getting quality sleep, managing stress through mindfulness practises, and considering supplements like ashwagandha and magnesium may support healthy testosterone levels.
Q2. What are the main causes of low testosterone in men over 50? Low testosterone in older men is primarily caused by age-related decline in hypothalamic-pituitary and Leydig cell function. Other contributing factors include Type 2 diabetes, obesity, chronic stress, poor sleep, and certain medical conditions. Lifestyle factors like diet and exercise also play a significant role.
Q3. What is considered a normal testosterone level for a 60-year-old man? For healthy men aged 60 and above, total testosterone levels between 100 to 400 ng/dL (3.5 to 13.9 nmol/L) or free testosterone levels below 50 pg/mL (174 pmol/L) are generally considered normal. However, individual variations exist, and it's best to consult with a healthcare provider for personalised assessment.
Q4. How does chronic stress impact hormone levels in older men? Chronic stress can significantly disrupt hormone balance in older men by elevating cortisol levels while suppressing testosterone production. This imbalance can lead to muscle loss, increased visceral fat, cognitive decline, and mood disorders. Managing stress through various techniques is crucial for maintaining hormonal health.
Q5. What role does sleep play in testosterone production for men over 60? Sleep is critical for testosterone production in men of all ages, including those over 60. Most daily testosterone release occurs during sleep, particularly during deep sleep stages. Poor sleep quality or insufficient sleep duration can reduce testosterone levels by 10-15%, equivalent to ageing a decade. Prioritising good sleep hygiene is essential for hormonal balance.
References
[1] - https://my.clevelandclinic.org/health/diseases/21855-osteopenia
[2] - https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2014.01595/full
[3] - https://pmc.ncbi.nlm.nih.gov/articles/PMC2528848/
[4] - https://pmc.ncbi.nlm.nih.gov/articles/PMC3377163/
[5] - https://pmc.ncbi.nlm.nih.gov/articles/PMC8584322/
[6] - https://www.healthdirect.gov.au/the-role-of-cortisol-in-the-body
[7] - https://thedoctorspractice.co.uk/the-science-behind-vitamin-d-magnesium-and-zinc-natural-strategies-to-optimise-testosterone-levels/
[8] - https://www.sleepfoundation.org/circadian-rhythm/how-age-affects-your-circadian-rhythm
[9] - https://www.healthline.com/nutrition/balance-hormones
[10] - https://www.jci.org/articles/view/158451
[11] - https://pmc.ncbi.nlm.nih.gov/articles/PMC2779572/
[12] - https://www.nature.com/articles/s41598-022-27269-6
[13] - https://pubmed.ncbi.nlm.nih.gov/15268754/
[14] - https://www.sciencedirect.com/science/article/abs/pii/S0378512210003166
[15] - https://www.adrenal.com/blog/the-dangers-of-excess-cortisol-understanding-hypercortisolism-and-its-complications
[16] - https://pmc.ncbi.nlm.nih.gov/articles/PMC5619133/
[17] - https://psychiatryonline.org/doi/10.1176/appi.ajp.2008.07091532
[18] - https://www.kendalathome.org/blog/breathe-easy-six-breath-exercises-for-older-adults
[19] - https://www.country-cousins.co.uk/resources/blog/wellbeing/6-breathing-exercises-for-older-adults/
[20] - https://pmc.ncbi.nlm.nih.gov/articles/PMC9510302/
[21] - https://www.who.int/news/item/30-06-2025-social-connection-linked-to-improved-heath-and-reduced-risk-of-early-death
[22] - https://nuvowellbeing.com/senior-social-connections/
[23] - https://jamanetwork.com/journals/jama/fullarticle/1029127
[24] - https://www.numan.com/low-testosterone/symptoms/testosterone-sleep-energy
[25] - https://pmc.ncbi.nlm.nih.gov/articles/PMC6438434/
[26] - https://www.everlywell.com/blog/testosterone/ashwagandha-testosterone/?srsltid=AfmBOoqdheJXlPc19vgZmsIkxMj6jm7iGScGxnwnq3YdyZw0quZw-42U
[27] - https://goldmanlaboratories.com/blogs/blog/natural-remedies-andropause?srsltid=AfmBOopfhMr9DOzy5_lsRzpR20-lA2yYDucae2lpvRCttdyprKJh4dwz
[28] - https://pmc.ncbi.nlm.nih.gov/articles/PMC4623306/
[29] - https://www.webmd.com/healthy-ageing/the-best-testosterone-boosters-for-men-over-50
[30] - https://www.va.gov/WHOLEHEALTHLIBRARY/tools/improving-low-testosterone-naturally.asp