Is Testosteron useful for longevity?

Whether testosterone is useful for longevity is scientifically unclear. Testosterone has anabolic effects that can preserve muscle mass and bone density—factors associated with healthy aging. However, there are also risks: elevated testosterone levels may increase cardiovascular risk and, in men, influence prostate cancer risk. The evidence is contradictory and mostly based on observational studies, not randomized long-term trials on lifespan extension. Moreover, hormone levels vary greatly between individuals; an 'optimal' testosterone level for longevity does not exist. The context you provided contains no direct studies or statements on testosterone and longevity. Therefore, I can only refer to general medical knowledge. Self-testing or supplementing testosterone without medical supervision is not recommended and can be harmful. The evidence level is 'mechanistic/conflicting'.