Jokes aside, we get to hear a lot that he's old, but he's probably not too old yet, otherwise he wouldn't call other elves sterile elders or Francesca Findabair an old hag. I think the spots on his chest only mean that he should take a bath more often.
Does he have gray hair? I never noticed. (besides, I'm 24 and I've had gray hairs since I was a teenager so that doesn't really prove anything ) ›››
I also think he´s not too old to have children if he wanted sometimes...
But he´s a leader of Scoia´tael comando so there is no time for romance, or baths obviously
And about his hair, I haven´t noticed that either.