The testosterone is responsible for the things you associate with the general appearance of men. During the puberty stage, the hormone is what builds muscle, deepens the voice, and increases the size of sex organs.
Throughout the life of a man, this hormone also drives libido and maintains the health of bones and muscles. The levels of this hormone reach their peak when the puberty stage approaches its end, around 17 years old. However, it usually retains high levels until around 30 years old. …Learn more →