Key takeaways
- Testosterone levels typically decline slowly with age, often by about 1% per year after 40.
- The American Urological Association uses 300 ng/dL as the threshold for low total testosterone.
- Short sleep can lower daytime testosterone by 10–15% in as little as one week.
- Strength training, healthy weight, good sleep and stress control are the foundation for healthy levels.
Testosterone is the main male sex hormone, and it influences far more than libido. It plays a role in muscle mass, bone density, red blood cell production, mood, energy and motivation. Understanding how it changes with age helps you take the right steps early.
How Testosterone Changes With Age
Testosterone usually peaks in a man's late teens and twenties, then declines gradually. Harvard Health Publishing notes that levels tend to drop by about 1% per year after age 40. The decline is slow and varies widely: many older men keep healthy levels, while others see a steeper drop linked to weight gain, poor sleep, chronic stress or health conditions.
Total testosterone is measured with a morning blood test, when levels are highest. The American Urological Association considers a total testosterone below 300 ng/dL to be low, alongside symptoms, and recommends confirming it with a second test.
Common Signs Men Notice
The most common signs of lower testosterone are reduced sex drive, low energy and changes in body composition. Men may also notice:
- Less interest in sex or fewer spontaneous erections
- Fatigue and lower motivation
- Harder time building or keeping muscle
- More fat around the midsection
- Lower mood, irritability or poor concentration
These signs overlap with stress, poor sleep and other conditions, so a blood test with your doctor is the only way to know your actual levels.
Sleep: The Overlooked Testosterone Factor
Most daily testosterone release happens during sleep, so sleep loss hits levels quickly. In a study published in JAMA, healthy young men who slept just 5 hours a night for one week had 10% to 15% lower daytime testosterone. Aim for 7 to 9 hours, keep a regular schedule, and treat snoring or suspected sleep apnea seriously.
Habits That Support Healthy Testosterone
Lift weights
Resistance training with large muscle groups, such as squats, deadlifts, presses and rows, two to three times per week supports muscle mass and healthy hormone levels.
Maintain a healthy weight
Excess body fat, especially around the waist, is strongly associated with lower testosterone. Losing even a modest amount of weight can help.
Manage stress
Chronic stress keeps cortisol elevated, which works against testosterone. Exercise, time outdoors, breathing practices and adaptogens like ashwagandha can help restore balance.
Eat whole foods
Get enough protein, healthy fats, zinc (meat, shellfish, pumpkin seeds) and vitamin D (sunlight, fatty fish). Limit alcohol, which can suppress testosterone production.
Where Supplements Fit
Natural supplements work best on top of these habits. Ingredients such as ashwagandha, maca and tribulus are popular choices for men who want daily support for vitality and desire. If you take prescription medication or have a health condition, talk to your doctor before adding a new supplement.
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- Harvard Health Publishing, “Testosterone — What It Does and Doesn't Do.”
- American Urological Association, “Evaluation and Management of Testosterone Deficiency” guideline.
- Leproult & Van Cauter, “Effect of 1 Week of Sleep Restriction on Testosterone Levels in Young Healthy Men,” JAMA, 2011.
- Lopresti et al., “A Randomized, Double-Blind, Placebo-Controlled, Crossover Study Examining the Hormonal and Vitality Effects of Ashwagandha in Aging, Overweight Males,” American Journal of Men's Health, 2019.
This article is for general educational purposes and summarizes publicly available information. It is not medical advice and does not describe the effects of any specific product.