I started getting grey hair around 22. Was working one day and suddenly a co-worker leans over and shouts out all surprised "Oh my, you're already getting grey hair!". Was a bit awkward but then we laughed about it.
And I'm always near a heart attack after taking a shower and looking in the drain - because there's always this huge ball of hair clogging everything up. But I'm 29 now and didn't really loose any hair on my head, even tho I still clog up the drain like some kind of animal since my teens. I loose hair EVERYWHERE but thank god it doesn't seem to affect my hair at all.
Even tho I once HAD a little bald spot close to my forehead - it was a small circle, around 3cm diameter. Really weird! But my long hair covered it up, so nobody besides me knew it was there. I had it for like a year or two and than it vanished again. I was really freaked out by that! I think it was due to stress, because I was having a rough time back then.
So yeah, I always was a bit scared of that. I know that this thread is mostly targeted at males but still wanted to share that