Low testosterone or normal aging?

What happens to testosterone with age

Testosterone tends to drift down gradually from early adulthood onward, rather than dropping suddenly the way estrogen does at menopause. At the same time, sex hormone–binding globulin (SHBG) tends to rise, so a little less testosterone is freely available to tissues.

This slow change is normal, and it's why the term "male menopause" is misleading. Many healthy men in their 60s and 70s have testosterone levels that are perfectly adequate.

What the research shows

The European Male Ageing Study followed more than 3,300 men aged 40 to 79. Of 32 symptoms investigated, only nine were linked to testosterone levels at all, and the three sexual symptoms were the clearest: less frequent morning erections, lower sex drive and erectile dysfunction.

Physical and psychological symptoms like tiredness, low mood and poor concentration were only weakly connected. The researchers concluded that genuine late-onset hypogonadism was relatively uncommon, about 2% of older men, and often tied to obesity and poor general health.

Midlife changes that mimic low testosterone

Many of these lower testosterone as well as causing symptoms, so a low reading can be a consequence of another problem rather than the root cause.

• Gaining weight, especially around the abdomen, which itself lowers testosterone
• Sleep apnea and short or broken sleep
• Depression, burnout and chronic stress
• Less physical activity and gradual muscle loss
• Regular alcohol use
• Chronic conditions such as type 2 diabetes, heart disease or kidney disease
• Medications, particularly long-term opioids and corticosteroids

Signs that point more toward real deficiency

These are more specific than fatigue or low mood and make a lab evaluation more worthwhile.

• Clear sexual symptoms: reduced desire, fewer morning erections, erectile problems
• Loss of body or facial hair, or shaving less often
• Breast tenderness or enlargement
• Shrinking testicles
• Low bone density or a fracture from minor trauma
• Unexplained mild anemia

How the question gets answered

The only way to separate aging from deficiency is careful testing in the context of symptoms. That means a morning total testosterone, repeated on a separate day if low, plus LH to show where the problem starts. The AUA uses 300 ng/dL as a reasonable cutoff, and the Endocrine Society advises diagnosing deficiency only when levels are consistently low and symptoms fit.

Testing during an acute illness, after a night of very poor sleep or later in the day can give falsely low results.

If it is mostly aging

If your levels are normal or only marginally low and symptoms are nonspecific, the most effective steps are usually not hormones. Strength training, losing excess weight, treating sleep apnea, reducing alcohol and managing stress can improve energy, body composition and sexual function, and in some men they raise testosterone modestly.

The FDA-approved testosterone labeling still carries a limitation that safety and effectiveness haven't been established for low testosterone caused only by aging.

A word about "low T" marketing

Advertising often lists vague symptoms like tiredness and irritability as signs of low testosterone. Almost every adult has these at some point, and research shows they're only weakly connected to testosterone. Treating them with hormones when levels are normal is unlikely to help and adds risks, including higher red blood cell counts and suppressed fertility.

Questions to bring to your clinician

What were my results, and were they morning draws? Should this be repeated? What else could be causing my symptoms? Would weight loss, sleep apnea treatment or reducing alcohol be expected to help? If therapy is an option, how will we monitor it and how will we know if it's working?

If it is true deficiency

Confirmed deficiency with symptoms can be treated, and therapy may improve sexual function and other symptoms. It requires monitoring of testosterone levels, hematocrit, PSA and blood pressure, and it suppresses sperm production. Men who want children should discuss fertility-sparing options before starting. Seek in-person care promptly for a testicular lump, severe headaches with vision changes, or breast changes.