Boys who grow body hair at 11 years old can usually still grow taller. Boys growing body hair may be related to androgen secretion, after entering puberty, the growth of body hair is a normal development of secondary sexual characteristics. When a boy enters puberty at the age of 11, the gonads begin to develop gradually, androgen secretion will increase, which can promote the development of secondary sexual characteristics, the body grows body hair is a normal physiological phenomenon. The growth of body hair is a normal physiological phenomenon. Before the epiphysis of the boy closes, it will not affect the boy’s height growth, and usually can still grow taller. During this period, it is necessary to pay attention to keep the skin clean and personal hygiene. Maintain a balanced and nutritious diet, eat more food rich in high quality protein and calcium, as well as fresh fruits and vegetables, do not picky about what you eat, avoid staying up late, ensure adequate sleep, and exercise appropriately. If the boy is 11 years old long body hair, height growth is slow or does not increase, it is recommended to consult a doctor in time.