The male penis usually stops developing at around 18-20 years of age. The penis is an important male organ with two important physiological functions, urinary and reproductive, and is influenced by the secretion of the male androgen testosterone. From about 12-13 years old, the penis begins to develop, and at about 18-20 years old, the male enters sexual maturity and the penis stops developing. And there is no concept of secondary development of the penis. As men continue to age, the level of testosterone secretion gradually decreases, and the penis will gradually atrophy. Therefore, in the process of penis development, pay attention to the protection of penis tissue, to quit bad habits, especially smoking and drinking, masturbation and masturbation, staying up late and working hard. In addition, adolescent men must pay attention to the development of the penis, to control their own life, diet habits. Pay attention to the regular work and rest, diet appropriate to eat some food containing zinc, such as oysters, beef and mutton, etc., to supplement the zinc element, for penis development is helpful.