Zooey Deschanel being 32.
Now, that's not entirely surprising, considering she looks great, really young and healthy and all, but if she's 32 now, that means she would have had to have been, what, 22 when she did Elf? She looks 32 now, BUT, she looked 32 THEN too, so I don't know what deal she made with the devil (just kidding). Granted, I haven't seen as much of her earlier work as I have her more recent work, but that does kind of explain why some movies around the same time, or a little before Elf, had her playing like high school/college-student-esque roles.