The relationship between testosterone and longevity is complex and not fully resolved. Observational data suggest that very low testosterone levels in aging men are associated with increased all-cause mortality, likely due to loss of muscle mass, bone density, and metabolic health. Conversely, supraphysiological levels (e.g., from anabolic steroid abuse) raise risks for cardiovascular events, prostate cancer, and sleep apnea. Current evidence is mostly observational; large-scale randomized controlled trials on testosterone replacement in healthy men with normal or mildly low levels are lacking. The optimal range appears to be mid-normal. Before considering testosterone therapy, a thorough endocrine workup (total/free testosterone, LH, FSH, prolactin, and possibly pituitary imaging) is essential. Self-medication is dangerous and may shorten lifespan. Genetic factors (e.g., SHBG polymorphisms, androgen receptor CAG repeats) modulate individual responses. Bottom line: Testosterone is not a fountain of youth. Lifestyle factors—exercise, nutrition, stress reduction—likely have a greater impact on longevity than hormonal manipulation.
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