The age at which a boy’s height stops growing needs to be judged on an individual basis, which is about 18 to 20 years old. Height is related to genetics, diet, environment and other factors, so every boy grows and develops at a different rate, and the time to stop growing is also somewhat different. If you want to determine whether a boy is still growing, you need to see a doctor for an epiphyseal examination. If the epiphyses have completely closed, it means that growth has stopped. Some boys will stop growing when their epiphyses have closed around the age of 17 to 18, but some boys will stop growing around the age of 18 to 20. It is important to eat nutritious food, have a balanced diet, and get enough sleep and exercise to help with growth and development. If any abnormal reaction occurs during growth and development, it is recommended to consult a doctor in time.