What is a person's growth potential in this situation?

A person has grown up in a poor country where he was malnourished, the air was heavily polluted, and there was a lot of violent crime, so he lived in constant fear. These factors caused him to not grow as tall as his genetic potential would have allowed. If he moves to a rich country at age 21, where there is nutritious food, clean air, and safe neighbourhoods, can this improved quality of life cause him to grow to his full genetic potential? Or is it too late in his life to grow taller?