I never tell them what age I think they are. I've sent in 4 deer, all bucks that I've had many pictures of so, I have a pretty good idea on age on the hoof. So far, their results have been the exact same as my estimates. I think they want to collect as much data as possible though. They do like to have 2 teeth in case there is a discrepancy about the age as to what the hunter thought, they then run the second tooth.