Whether or not you will grow taller at the age of 23 depends mainly on whether or not your epiphyses are closed, and if they are, you generally can’t grow taller. If the epiphyses have closed, the height of the person will not change significantly. However, there are some people who have their epiphyses close later, and when they are 23 years old, their epiphyses still haven’t closed completely, so they can continue to grow taller, but generally there is not much room for them to grow taller. If the epiphysis is still not closed at the age of 23, the diet must pay attention to increase nutrition, eat more food rich in protein and calcium, and usually do more physical exercise, which will help to grow taller. But if the epiphysis has already closed, generally there is no special way to continue to grow taller.