I've heard the same thing about aging the meat before processing and putting in freezer. My deer usually sits in a cooler for a week before I can get it all processed because I do a little at at time. I would say some of my deer is aged and others is not. I have noticed no difference in taste or tenderness. I find that whether its a young one or an old buck make more difference in taste. The young ones taste much better and are much more tender. An old buck is going to be tougher regardless of what you do IMO.