Newton's hair!

Isaac Newton.

Let me tell you all, I had one hell of a time researching about Newton's hair :P

Although I didn't find out much, here are a few things worth writing about it : 

1. He had shoulder length hair, blonde.
2. He never cared to wash it, comb it or even admire it in the mirror.
3. Since he was an alchemist, many locks of his hair was found to have deposits of Mercury on them.
4. His hair turned grey when he was in his 30s (quite obviously)
5. Many people in the late 70s and early 80s sported this hairstyle =)

Brian May, rock guitarist.

Steven Tyler, lead singer, Aerosmith