Correlates of testosterone change as men age

Area of Science:

• Endocrinology
• Andrology
• Gerontology

Background:

• Testosterone (T) correlates in men are diverse, with limited understanding of age-related changes.
• Existing literature lacks comprehensive analysis of how T associations vary across the male lifespan.

Purpose of the Study:

• To investigate eight putative correlates of testosterone across different age groups in men.
• To determine how T relationships evolve with advancing age in a large male cohort.

Main Methods:

• Analysis of a large sample of British men.
• Testing eight specific correlations of testosterone across the adult age range.

Main Results:

• Seven of eight tested testosterone correlations were replicated.
• Significant age-related variations were observed in T diurnal cycles, T levels in single vs. married men, and T in smokers.
• The inverse relationship between obesity and T persisted across adulthood.
• Testosterone decline shows a steep drop around age 30, a potential rebound near 50, and stabilization thereafter.
• Health-related T correlations (HbA1c, diabetes, metabolic syndrome) strengthen with age, becoming more significant after 30-40.

Conclusions:

• Most previously suggested testosterone correlates are empirically supported.
• Health status emerges as a more significant, albeit not overwhelmingly strong, correlate of testosterone in older men.
• Healthy older men tend to have higher testosterone levels than their less healthy counterparts.