Male pattern baldness is quite prevalent in my family..... My dad's dad was bald on top with hair only inhabiting the back and side of his head, my dad's pretty much the same and has been since his late 20s/early 30s and my brother (who's 3 years younger than me) followed the same path.
Thankfully, at the age of 38 I have a full head of hair with a little grey around the sides. For about 10 years people keep referring to my "sun spot" although I think it only looks like it's thin as I have my hair quite short and it hasn't really change in size since my early 30s.
My mum's dad had a full head of hair when he passed away at the age of 66, I seem to have inherited his genes for green eyes (everyone else in my family has blue eyes) although my granddad died due to health problems caused by obesity (5ft3in "tall" and 24st) so hopefully I only got the hair & eye genes
Having said that, I've kinda resigned myself to the fact I'll lose my hair but will just go for the close cropped look rather than going the comb-over route and trying to get everyone to collude in the illusion that I still have a full head of hair