Whether or not a 15 year old with a net height of 176 can still grow taller requires an X-ray to determine whether or not the epiphyses are closed. If the epiphyses are not closed, then there is still potential to grow taller; if the epiphyses are closed, then the height is already fixed. 1. The epiphyses are not closed: If the X-ray examination shows that the epiphyses are not closed, it means that there is still potential to grow taller, and you can ensure sufficient rest, strengthen nutrition, increase protein and calcium intake, and exercise appropriately to promote growth and development, and promote the growth of height. 2. Epiphyseal closure: If the X-ray examination shows that the epiphysis has closed, it means that the growth and development of the bones have stopped, and there is almost no possibility of growing taller, and the height has been fixed. If you are 15 years old and have a net height of 176, you need to go to the hospital for a complete examination and listen to the guidance of a professional doctor.