Men go through AMS between the ages of 35 and 65 (normally between 40 and 55) when their hormone levels (especially testosterone) go down. Testosterone is a hormone that helps maintain sex drive, sperm production, pubic and body hair, muscle, and bone. Testosterone levels decrease over time. This decline is normal in healthy males as they age. Unlike women who lose their fertility (ability to get pregnant) when they reach menopause, men do not lose their fertility. All men have different experiences' some men's hormone levels go down more than others, and some have more symptoms than other men.
A decline in testosterone can affect a man's body. AMS has many signs:
