He's a handsome fellow, despite the broken antler. Young, I'd say, or perhaps just coming into his prime. I've noticed before that the males seem to have lighter faces and that contrasting forehead, helping identify them even when antlers are lacking. Unlike Whitetailed Deer, our Mule Deer have antlers with an even dichotomous branching pattern—each side splitting into two forks, and so on. In Colorado, we'd call this guy a "5-point" buck I think, counting only one side. (Elsewhere, both antlers count, but with Muleys you only have to multiply by two for the equivalent. I'm not sure, though, whether the little prong at the base counts.)
C'mon, Baby Doe—look at those big brown eyes!