Too bad I don't know how to post these pictures bigger.
In the first photo the 2nd bear from the right was an older mature boar and you can see the canine was kind of squared off.
In the pic below, that biggest one in the middle was also a large mature boar, but still in his prime with perfect teeth.
I was on a hunt once where one of the guys shot a big old bear that was so old his canine teeth were worn down to flat nubs.
My wife has asked me to select smaller bears now, for their finer meat quality.