re: Best Way to age a buck in the field?

I am a biologist and have aged on average 50 deer per year for 24 years. The best method requires killing the deer and pulling incisors, cross sectioning and aging like tree rings. Second best is looking at the lower jaw, which I think I can be within 1 year at over 90% of the time with my experience and the feedback I have received after the incisors, double checked my estimations. But I am not comfortable aging by looking at antlers because genetics and climate factors are too big of factors to just throw into the equation when trying to decide if a buck is a cull. We don't do that because we know a hunter cannot be held accountable for that.