The key to me is that his haunches are still round and full, add that to his girth (which we're kind of guessing at since there's no front or rear view... don'cha hate it when the deer don't pose properly for the camera <grin>), deep chest, relatively straight back, etc. and I think you have a Buck in his prime (5 1/2 to 6 1/2) but clearly this or next is his last prime year given how long you've been watching him and the other signs... This is a deer that anyone would be proud of, and could be a QDMA Poster Boy...

Stoney
{getting ready for rifle season opener here in NY on Saturday... with very high hopes and who'd kill (the deer) to see a buck like that!!! <very hopeful look>}