I was 5...first, I got this weird idea that Santa was actually "mom and dad" because Santa used the SAME wrapping paper as the gifts from mom and dad!! lol So then I told mom that "Reindeer can't fly!" and "How could Santa go around the world to everyone's house in one night WITH flying reindeer??" I just didn't think it sounded realistic, even at age 5, so mom told me! They still signed "from Santa" on the gifts up until a couple years ago though!