Not a lot to go by, but I do believe the one in the top pic (split brow) is likely 3 1/2.
To me, he seems too "developed" for summertime to be only a 2 1/2 (talking about his body, not his antlers).
During the summer months,
most of us seem to have a tendency to under-age bucks,
although I agree with Mike this is possibly only a 2 1/2-yr-old buck.