That's a horn growing machine! From that pic he does not look very old.
wut? I realize it's one picture and you never know how he is truly standing, but I see
Sitting back on hocks
Deep brisket/neck juncture
Very heavy neck for 9/24
Younger deer typically don't have stickers like that, especially 700 acres LF
If you said guess an age from one pic, I'd say at least 5.5.