From about 21 months and up, it is pretty dang hard to judge age on a LIVE wild hog. They don't really get shortened muzzles and swayed backs like whitetail. Maybe a little "wider" in the jowls but not always. I judge hogs by how easily you can turn them on a spit over a nice hardwood open fire

From 40 to 150 pounds is what I deem "perfect age". From 150 to 250 is what I deem "sausage age". From 250 and up is what I deem "Buzzard bait age". Fairly easy "aging" calculation if you ask me