I say he's 5+ based on the chiseled characteristics of his face, but I think you really need to re-evaluate once he hit's the rut and swells up. Should be easier to tell then. He's in late summer faze, so he looks more lean, which makes him look more youthful. See if he swell up like a toad.
I shot a buck a couple years back on a state park hunt that was 8 1/2 + and had already shed his antlers. His face look very similar.
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