Yes he's a very good looking buck. Plenty healthy. I doubt he's a day under 5.5yrs. Probably 6.5+.
I'd be beside myself trying to hunt that deer. If you can figure him out and predictably get on him, there wouldn't be a buck on the planet you couldn't kill. There's so much to learn from an old buck like that. He knows from experience how to not die and has outwitted every other hunter before you.