One can also send ine jaw bone and they will use one of the molars for aging as well.  I did that with two deer that I found dead after season that I had history with and had put on the target list. I wanted to see if my age estimation was in science's ballpark.  They both came back 4.5 and that is what I had estimated.  I don't put my estimates on what I send to Deerage.com as I want them to have no other input besides what is given by the tooth evidence.