Bet if you call the taxidermist before he skins it out, he will age it for you. Around here, if you ask, taxidermists will pull jawbones and save them for you. Racks by themselves are a pretty not a real accurate gauge of age and they vary quite a bit based on location. On my place, that deer would likely age at 2 1/2 but could possible go 3 1/2. In other locations that could be different. It took us quite a few years to get a handle on what a 2 1/2 year old looks like compared to an older deer. We've shot a lot of them while learning. I live about 80 mile away from our farm. Near where I live, that deer would more likely be 3 1/2 than 2 1/2.
Thanks,
Jack