My dad (RIP) was a slaphead in his mid 20s
and one of my brothers has followed suit (tee hee). One of my granddads had a full head of hair when he pegged it age 85; mine seems to have genes from a bit of both... my hair receded quite a lot in my mid 30s, but now (mid 40s) it seems to have stopped receding (honest!)... it's been the same for about 5 yrs now, and others have raced ahead of me in the slappy stakes.
It doesn't bother me anyroad, even if i woke up totally bald tomorra (and I have it cut short too, once a month, number 3). In the words of my dad, "Grass doesn't grow on a busy street".