I'd have guessed 3.5 from the pic. However, with mild winters, good feed, minerals and genes young deer can grow amazingly fast. I believe the tooth data over my own eyes. I have seen quite a few 2.5 year old bucks over the years that were 20-22", 4x4 (with and without eyeguards). On the flip side, I once checked a small Wyoming 2x2 that I had already decided was a yearling, until I flipped down his lower lip and saw extensive tooth wear - he was lab aged at 5.5