Well, I think this is a fascinating thread:

A bald-headed man asked me today why is it that they (men) get to a certain age and their hair stops growing on their head, but starts sprouting out of their ears?

Or for women: menopause (altho' I'm not planning on one of those :) - when the growth rate of the hairs on your legs slows down - giving you more time to deal with the fuzzy little moustache that appears on your top lip....