I don't see his age being a factor in whether or not he'll bond with you. I've heard of people who have rescued hedgehogs that are a few years old who love them and snuggle with them and I've also heard of people who bought 7 week old babies who after quilling want nothing to do with them. I think it's really dependent on that particular hedgehog's personality.
Is it possible for you to go see the hedgehog in person before making a decision?
At any rate I hope he's a match for you