Reason I asked is most aging progressions are done with cheek teeth of the lower jaw. This guy has enough wear that he was definitely a mature deer, especially the one where all of the dentine lakes have been worn into a single surface. The uppers wear more slowly than the lowers, so I am going to say he was near the top - quite a bit of wear, but still a fair amount of enamel remaining. Since blacktails have a longer wild maximum lifespan than mule deer or whitetails, I would guess age is somewhere between 6-9 years.