Age is the key factor in growing big racks but it depends on the area you're in. Where I grew up in upstate NY a buck was lucky (or smart) to be able to see his 3rd year. If he's not going to have the opportunity to reach his full potential at say 5 1/2 years, at which time he'd probably be a real nice buck, then you may want to capitalize on your oppotunities at him. It comes down to a personal decision and the choice is competely yours.