text: how do i grow taller and is there time left? hi, i'm an 18 yr old boy and i was wondering if i could still grow taller than i already am and if so, how - any suggestions? you might still grow a little - but not much i'm afraid: probably an at the most! boys tend to have a large growth spurt during their middle teen years (14-16). this is when most of your growth would have taken place. this is in contrast to girls who usually start their growth spurt early in their teens (12) but theirs is more slower and gradual. both males and females stop growing around about the age of 18-21!