Boys height grows to a few years old does not grow this no fixed value, there are individual differences, most people height may be in the age of 20 to 22 years old will stop growing. Boys’ height due to the existence of individual differences, in addition to genetic factors, may and diet, exercise, sleep and so on also have a certain relationship, some boys if the usual diet like to eat greasy food, and do not love sports, epiphysis and diaphysis fusion early, there may be a height early stop development. Most boys who have a regular diet, exercise and sleep well may stop growing around the age of 20 to 22.