I gradually had a little puberty and growth from 12 to 14...at my 15, I had a drastic change...first I has too much testosterone produces so I has a bug rush of growth and my penis grew since then... I started at 12 centimeters at 12 and I'm now 25 and really thick. I thin kt<s still growing. I had a huge boost at 16 to 18 ( gained 6 centimeters) I was really proud... still am