To age deer on the hoof can be pretty difficult there are some articles out that you can read, VCR tapes are great also. I have one that is called judging trophy whitetails. the first thing I do is forget about the Horn's they get in the way of aging. You should concentrate on the body shape. very simply put. I'm 48 years old, my son is 26 you stand us up next to each other with our shirts off and our faces covered it ain't hard to figure who the old guy is.