I use the info that the state has gathered on deer checked at management area's. It has body weights for different age classes and antler circumference for the different weight classes. We weigh every deer we kill and we use that as well as body characteristics to determine age, best we can. Qdma is about letting 1.5 year old deer walk, shooting doe, and trying to harvest 3.5 year old and up bucks. People confuse QDMA with TDMA(trophy deer management). We try to practice QDMA.