My son turned 9 a few months ago and last night he came to me with itchy armpits and asked me to have a look and see what was causing it. I found a few black hairs on each armpit. (I only have sisters, and apart from my Dad and my husband, I haven’t had a lot to do with males. So the whole boys and puberty, growing up etc are new to me). He has needed to wear deodorant on and off for about a year now, and now with these few hairs starting to grow he is obviously starting to go through puberty. My question/s are, is 9 a normal/average age? I was about 11 when I started sprouting underarm hairs and my sisters were all around that age as well. How soon after underarm hairs do pubic hairs start to grow? Our son is super excited about it, but I can’t help being a little bit sad that my baby boy is growing up way too fast.