I go by the body weight and frame of a deer when aging them also. To me he looks to be a little older then everyone else thinks. His head looks awfully big and it seems to have some grey in it. I would say he's possibly on his down hill slide. Without seeing the body its hard but i'm going to take a shot at it and say 5.5 or 6.5 possibly. He could be a young deer, bad picture for aging!