Our hairline goes way back before dinosaurs lived.
Ancient Hairline
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Explain Bear
Listen up, buttercup. This joke is all about how someone's hairline is receding so far back on their head that it's like, ancient. Dinosaurs, see, they lived a loooong time ago. So, saying someone's hairline goes back further than that is a funny way to say they're balding. You probably have the same problem, judging by that dumb look on your face.