Heck, I'm 23 and just yesterday forgot my wallet when the wife and I went for an outing. Got about a mile down the road and realized it, so I turned around and went back. As I got out she told me to grab her sunglasses and water bottle. So I went up and grabbed her sunglasses and water bottle, walked out and closed the door. I was about to lock it when I got the overwhelming feeling I'd forgotten something, and then it clicked that I still hadn't grabbed my wallet.