I agree 100%. He's 3.5, and plenty big enough for me. I wouldn't hesitate a second to put one in him, and be tickled doing it.
Of course you might [probably are] be hunting a much better area than I am. Just seeing a 3.5 y.o. deer in my area is cause for celebration.
Good luck no matter your decision.
If your in the middle of 10K acres, and no chance he will get killed by another, pass, if thats not your scenario, shoot him and be proud of a great deer.