I'm 30 years old, started paleo with no expectations except to lose weight. That's the least of the things that's happening (18.4 pounds in 25 days!).
I lost the white hair that was at my temples. I still have some grey, but it's about 20% of the levels I've had in the past few years.
Every day I see less and less grey, and am wondering if I'll get rid of it completely.
I was at a point where I was coloring it to get rid of the white, but I stopped that and my barber is now asking me what the hell I was doing, because he couldn't figure out why my hair is darker than before. So I think I got a paleo convert :)
I wonder why it is actually worse in your case. I would assume stress, I've had a couple really stressful jobs over the last couple years. I know that the stress or the fact that I ate sugar and processed carbs like they were going out of style probably contributed to mine.
So two things to consider. Well, at least two things I might think of...
Fish oil intake? I do the damage control from Robb Wolf's book the Paleo solution (well, at least for the next couple weeks).
Sleep? I know that's important for restoration of the body's healing process.