Really hard to tell from the way he is standing and that one pic. He does not have a very large pad on his hocks or the head/face for a mature buck. He looks mature and that may be from the way he is standing also.
This is what I saw, too, so I guess that I am now as good at aging deer as stxranchman. Yeap
All joking aside, he's at least 3.5, probably older, but something about his head and neck compared to the rest of his body doesn't seem to look proportionate to me. I'd need to see more photos, and in another month or so his body should really start showing his age a lot more clearly. Nice deer, though.
What county are you in? I'm curious how the deer herd in areas south of Austin from roughly Caldwell to Gonzales to Houston is doing these days. Seems like the first counties with AR's were in this area and it was a decent amount of time ago, too. I wonder how much that has improved the quality of the deer down there over that time span.