Genes are not this simple. If you dad and mom may both have SuperHair. You may still get balk because your grandpa's wife's dad married a girl from bald family! Most of my friends with SuperHair, their dad are NW6-7 at 50 age. my dad nw1 at 55 and mom also have good hair at 48, i'm still balding diffuse 50% hairs lost 6-7 months back.