Uhh, lots of old ladies have "stray" white hairs growing from their chin or neck. A couple of those really coarse hairs sticking out, apparently from nowhere.
I, um... have several hairs growing from my chin, actually they are kinda dark. YUCK! I have had them for several years now (I'm mid-20's). I also have one dark hair that grows near my elbow. So I just pluck out those hairs. I would like to know what causes them, too. My leg hair on the lower half of my calves is pretty dark, coarse and vigorous. I don't know if that's a good or bad thing.