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How does age affect testosterone levels?

Age has a significant impact on testosterone levels. In men, testosterone production generally peaks during late adolescence and early adulthood, and then gradually declines with age. This decline, often termed "andropause" or age-related hypogonadism, is characterized by a decrease of approximately 1-2% per year after the age of 30.

Various factors contribute to age-related testosterone decline, including changes in testicular function and decreased sensitivity of the hypothalamus and pituitary gland to hormonal signals. This decline can lead to symptoms such as reduced muscle mass, bone density, libido, and energy levels.


  1. : Harman, S. M., Metter, E. J., Tobin, J. D., Pearson, J., & Blackman, M. R. (2001). Longitudinal effects of aging on serum total and free testosterone levels in healthy men. The Journal of Clinical Endocrinology & Metabolism, 86(2), 724-731. doi: 10.1210/jcem.86.2.7219

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