Exercise prevents gray hair?

Now that I've rounded the corner to middle age (there, I said it), I've started to take my health more seriously. So, it is with great interest that I read this article on exercise and aging. Based on this mouse study, exercise helps prevent gray hair and muscle loss, keeps your heart healthy and maintains brain volume.

http://well.blogs.nytimes.com/2011/03/02/can-exercise-keep-you-young/?src=me&ref=general

Check this out and you may end up hitting the treadmill!