Introduction.
Many studies suggest the essential role of testosterone in keeping vigorous metabolic processes throughout the body. However, with age, testosterone levels decline, and the levels of sex hormone-binding globulin increase, both trends resulting in decreased bioavailable testosterone with all its benefits. The Baltimore Longitudinal Study of Aging published the rate of hypogonadism (reduced testicular size) as 20% in men over 60 years of age, 30% in men over 70 years, and 50% in men over 80 years of age.
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