I think a key requirement of believing in the non-biblical aspects of Christmas such as Elves, Talking Snowmen and even Santa Clause is having a good Imagination.
Who was it that ruined or tried to ruin your belief in Santa Clause by telling you he isn’t real?…. Before you go blaming me, I am confirming or denying nothing! I refuse to ruin anyone’s beliefs…. Truthfully, I don’t remember when or how I was told or gained knowledge. I know at some point Santa’s presents stopped coming. But, that doesn’t necessarily mean he isn’t real.
Maybe he focuses more on the younger set because they hang onto their Imaginations a little bit longer.