This deer spent about all of 2015 on my place and disappeared late summer.
I'm amazed at his winter body versus his summer body. I'd now say he is at least 5 and probably will never have a better rack. But who knows - he may add another point and be a fairly nice 8 next time.
I agree that the antlers are the only clue. And it illustrates why you can't age a deer in the summer. Look at the difference in the neck and shoulders.