When the teeth are cut, an age and a "rating" are given. The "rating" ranges from A-C. An "A" would suggest that the tooth was read with a high confidence of accuracy. Anything other than a "A" rating, I wouldn't put too much confidence in.
I'm not sure why the ratings are not included in the report issued from the division.
As a side note, I have noticed that even self-proclaimed wildlife experts have been terrible at judging age classes of deer and elk. I have even heard people give guesses of age from looking at sheds. I think it stems from an inability to look past the antlers, mixed with lack of knowledge of other physiological traits that can aid in aging an animal.
Antler size can be extremely variable and can be a poor way to judge age.