What role does Testosteron play in longevity?

The role of testosterone in longevity is complex and debated. Observational studies suggest that low testosterone in men is associated with increased all-cause mortality, frailty, and cardiovascular risk. Conversely, very high or supraphysiological levels (e.g., from misuse) may raise risks for prostate cancer, sleep apnea, and thrombotic events. The age-related decline in testosterone is physiological, and routine testosterone replacement therapy in healthy older men without hypogonadism is not currently recommended due to a lack of long-term randomized trials on mortality. The evidence is largely observational (human-moderate) and confounded by factors like obesity, chronic disease, and lifestyle. A direct causal effect of testosterone on lifespan is not established. MyBody-X tests can provide a single-time snapshot of testosterone levels but cannot assess longevity. Be cautious of overhyped 'anti-aging' claims. Medical evaluation for hypogonadism symptoms is appropriate, but self-supplementation without indication is risky.