Low testosterone was once considered a problem for men in their 50s and 60s. That is no longer the case. Testosterone levels in men across all age groups have been declining for decades — and today, clinicians are routinely seeing men in their 20s and 30s with levels that would have been considered low even for men 30 years older.
A landmark study published in the Journal of Clinical Endocrinology & Metabolism tracked testosterone levels in American men over multiple decades and found that average testosterone levels had fallen approximately 1% per year since the 1980s. A 40-year-old man today has significantly lower testosterone on average than a 40-year-old man in 1985 — even when controlling for age, weight, and health status.
The causes are multifactorial. Environmental endocrine disruptors — plastics (particularly BPA and phthalates), pesticides, industrial chemicals, and xenoestrogens in personal care products — mimic estrogen and suppress testosterone production at the hypothalamic-pituitary-gonadal axis. Chronic stress, sleep deprivation, sedentary lifestyles, ultraprocessed food diets, and rising obesity rates compound the picture. Obesity in particular converts testosterone to estrogen through aromatase activity in adipose tissue — creating a feedback loop that further suppresses testosterone.
The symptoms of low testosterone in young men are often dismissed or attributed to stress or depression: persistent fatigue, reduced motivation, low libido, poor gym performance, brain fog, mood instability, and difficulty building or maintaining muscle. These symptoms can be career-limiting and relationship-damaging — and they are increasingly common.
Young men deserve a complete hormonal evaluation — not just a TSH and a CBC. If you are under 40 and recognize these symptoms, call 844-734-2112 or reach out to our team for a full assessment.