that's not always accurate. the forage they have has a lot to do with tooth wear. where i hunt in texas the deer always score +1 yr over what they really are. the only way to be 100 percent certain is to cut the tooth and count rings. i'm lucky enough to have a vet hunting with us that has taught us all this. without seeing the profile view of the body we are all guessing on a "field-age". at 4.5 yrs they will have a small belly but the sway back wont be as pronounced as a 5.5 yr old. 5.5 and up is easy, less than 5.5 takes a good eye/lots of time to develope.