Evidence check: Testosteron in the context of longevity

The role of testosterone in longevity is complex and debated. Epidemiological studies suggest that moderate testosterone levels in men are associated with better cardiovascular health, higher muscle mass, and bone density—factors that may contribute to a healthy lifespan. However, some observational data indicate that both very high and very low levels are linked to increased mortality. Importantly, these are associations, not proven causal effects; confounding by lifestyle, obesity, or chronic illness is likely. Evidence comes mainly from epidemiological and mechanistic studies, not from long-term randomized trials on longevity. For women, data are even scarcer. Testosterone replacement therapy carries risks (e.g., cardiovascular events, prostate cancer) and should only be used for verified deficiency under medical supervision. Direct recommendations for extending lifespan cannot be drawn from current evidence. A healthy lifestyle with balanced nutrition, exercise, and stress management has far stronger evidence for promoting longevity than manipulating individual hormones.