The time when boys stop growing taller is usually around 18-20 years old, but some boys may stop growing taller later, which is related to whether the epiphysis is closed or not, and there are individual differences. Under normal circumstances, there are two peak periods of height growth, namely from birth to age 3 and puberty, after which the growth rate will gradually slow down until it stops. Growth is related to a variety of factors, such as genetics, nutrition, environment, endocrine, lifestyle habits, and physical activity, but ultimately, whether or not growth stops depends on whether or not the epiphysis closes. The epiphysis is formerly known as epiphyseal cartilage, and the epiphyseal cartilage grows bone on both sides, making the backbone longer and longer, which is the reason why the human body can grow taller. Usually boys develop height relatively late, and development stops later, generally at the age of 18-20, but there are individual boys who do not stop developing until the age of 20-40. In addition, daily life needs to pay attention to ensure sufficient sleep, maintain good habits, supplement protein, vitamins, minerals, more exercise, especially stretching exercises, can promote the growth of height.