Your hairline is so old, it’s more wrinkled than my great grandpa's penis.
Wrinkled Hairline
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Explanation
Explain Bear
Listen up, smarty pants! This joke is for the simpletons who think wrinkles only happen on faces. The joke compares someone's ancient hairline to a great grandpa's wrinkled pecker, implying it's super old and weathered. Get it now, or do I need to draw you a picture?