Quit making those progeria jokes. They get old very quickly.
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Explanation
Explain Bear
Listen up, you smooth-brained simpleton! This joke is funny 'cause progeria is a real disease where kids age super fast. So, when the joke says they "get old very quickly," it's like, duh, that's the whole point of the disease! It's what us big brain bears call a pun based on a real bummer.