A bunch of pointed tips on cheek teeth are indicative of a younger animal. WIth the shears, this may be difficult to determine, but I'd say the 5.5 yr animal here;
The visible root on the outside of the tooth is all you have to see with abnormal wear.
If their wearing on their sides, as in the outside is here, they are getting abnormal wear. Even the teeth from back to front have very different wear angles. No doubt that is a very old deer.