Testicular Aging

Testicular aging refers to age-associated changes in testicular structure, endocrine function, and spermatogenesis. With advancing age, testicular tissue shows reduced germ cell number, altered Sertoli and Leydig cell function, and impaired hormonal signaling. Testosterone production gradually declines, affecting reproductive capacity, muscle mass, bone health, metabolism, and mood. Testicular aging also involves increased oxidative stress, mitochondrial dysfunction, and accumulation of DNA damage within germ cells. These changes reduce sperm quality, motility, and genetic integrity. Testicular aging reflects both intrinsic cellular damage and altered hypothalamic–pituitary–gonadal regulation. Although fertility may persist into older age, reproductive efficiency declines significantly. Understanding testicular aging provides insight into male reproductive health, endocrine aging, and systemic effects of androgen decline. This knowledge supports strategies aimed at preserving reproductive function and mitigating broader aging-related physiological changes.