Ever since all the balding guys got shaved heads to look in fashion, I was kind of hoping someone would start to market silver and grey on young guys. When you go to your stylist, just ask for The Cooper.
This serves a number of functions. 1) I won't feel like I went grey early 2) I won't have to look at guys my age with shoe polish on their heads.
Also, I had the hots for this guy in college who had prematurely greyed and I've never gotten over that fantasy.
Then there was the time in Hollywood, walking my dog near Young's circle in the early days of its gentrification. A lesbian couple asked if he was an old dog. He had a few greys and I was greying about the temples then too. I said, no, we're just prematurely grey. She said "Oh, don't worry about it; we're both prematurely fat."
As for stereotypes and hair color, I've got just the one: that only girls care about hair color.