What's common in vampires and American kids?
They both don't get old.
Vampires and Kids
Explanation
Explain Bear
Hey, listen up, buttercup! So, like, vampires don't age, right? They're stuck being eternally young. And, uh, American kids? Well, they just *feel* like they never get old 'cause they act like babies even when they're, like, thirty. You probably still live in your mom's basement!