The bucks that hang around the best habitat can be worth a few young bucks wandering away! If you have the doe's you'll have bucks sooner or later! I think because of the pressure in most places, any 3.5 year old buck should be considered old enough to harvest by a hunter. The smart 6+ yearold buck's you don't know are there are the ones that suprise you. Hunters harvest monster bucks in heavily hunted area's all the time, so it does happen on occasion.
"Let a young buck go, so he can grow."