I like the special character of those calcium deposits (nodules) near his bases. Very pretty rack.
I think he could be as old as 4 1/2, but could be only 3 1/2. Based on your prior year pic, don't think he could be any older than 4 1/2.
But, if he does start looking more like a 3 1/2, consider that he would likely gain considerable more mass living a year longer, along with some of those calcium nodules become scoreable sticker points. Very hard to let a 140-plus class buck walk, but just consider what another year might do if he's only 3 1/2.