men's testerone level

Testosterone is a male hormone and is being produces first in a male fetus just seven weeks after conception. In adolescents testosterone changes the voice of a teenage boy, makes his muscles fill out, and stimulates his sex drive. In adult men, the hormone plays a role in maintaining muscle mass and strength, fat distribution, bone strength, and red blood cell production, as well as libido and sperm production. A metabolite of testosterone promotes baldness, although testosterone treatments do not. Men hit their peak with testosterone at about age 17. Levels plateau for a while, and then slowly start to slide in their 30s and 40s. By the time a man reaches 80, his testosterone level will be about half of what it was when he was a young man.