Man I have a huge patch of white hair from a birth mark.

Is your avatar a picture of you? If so, I hate to break it to you, but you're entirely covered in white hair.

I wouldn't say normal... but it's fairly common.

I knew a guy who was 16... already balding, full beard.

The only brightside for him was he could buy beer without getting carded.

my cousin has greys and had them since 14

I dont have and Im 19, but we had a friend whos had a few at 15.

Quite normal. Sometimes i get a gray or a red hair somewhere. My mother had her hair completely white at 19 years old, my father only got first gray hair at 50.

Completely normal. I started a couple of grey hairs when I was 18.

Look at it this way. It's better to have grey hair than no hair.