I have a bit of grey/white hair, exactly where (and only where) I've been tucking it behind my ears for the last couple years to get it out of my face. I have to assume hair loses color when it isn't able to breathe, kinda like how you always see people who wear baseball caps losing their hair. I never wear hats (except a tam I'll be getting soon) but anyway, something I've noticed lately is maybe some of the hair color is coming back? Is that possible? I've been keeping all my hair I possibly can out from behind my ears, and just recently I got some dreadlock shampoo (from our favorite site here) and I dunno if it's just me, but after using it just once I swear there's more color in those areas.
Either way is fine with me. I actually was looking forward to having a single lock on each side being mostly white.