Hi You have not mentioned what is your present height. Tallness depends mostly on the genes you inherit from ur parents & region from where u come from etc. With regular exercise & good diet, within a particular age, there is a possibility of growth to some extent. If u r healthy and active, & of average height, don't worry. There is a slight chance to increase in height with medicine,if the tips of ur long bones are calcified & fused Gud luck