nanimous in holding that the non-existence of an actual minor was of no moment; defendant's belief that he was F.3d 1222, 1227-32 (11th Cir. 2002); United States1 Sims, 428 F.3d 945, 959 0th Cir. dealing with a minor was sufficient to make out the crime. See United States Root, 296 2005); United States I Helder,