After the development of 13-year-old boy is completed, if the epiphysis has not yet closed, he can still grow taller. Usually epiphyseal closure occurs at the age of 16 to 18 years, indicating that the growth and development of the organism stops and can no longer continue to grow taller. If the development of a 13-year-old boy is completed and the X-ray examination shows that the epiphysis is closed, he will not grow taller under the state of natural growth. Adolescent height growth is also affected by many factors, such as sex hormones, nutrition, sleep, physical exercise, mental state and so on. It is recommended to maintain balanced nutrition, ensure adequate sleep, and appropriate physical exercise to help grow taller. To determine whether a 13-year-old boy can still grow taller, it is necessary to make a comprehensive judgment, and it is recommended to go to a regular hospital to check whether the epiphysis is closed, whether the endocrine hormones are normal, and whether other factors such as nutrition are normal.