Turning 52 next week. Have never let myself get out of shape (too much). Every fall I strap on a 10 lb pack, take my rifle, and hunt 6 to 12 mile days in badlands with lots of hills. Often this includes packing out a mule deer. Getting tougher but I won't give up.
I'm really glad I've stayed this way, some of my friends can't do very much anymore.