Why do I have gray hair?

Factual Questions
1

Dear Anyone Who Can Help:

Since I was about ten or so years old I had gray hair. I’ve asked some doctors about it and they had no idea how I could have gray hair at that age. Any insight on this subject would be appreciated.

Thanks for your time.

2

Welcome to the SDMB, megamanxx!

New Scientist had an article on this:

Why does hair turn grey?

3

In fact, Cecil has answered this one aswell:

http://www.straightdope.com/classics/a1_267.html