THIS IS A BONER THAT’S NOT A BONER

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Your bones are made of living tissue, and the collagen — a protein found in tissues — is constantly replacing itself. Once your skeleton is completely formed and your body is through growing, your bones will regenerate every 10 years, says OrthoInfo.

This means you basically get a brand-new skeleton every 10 years (give or take a little). Your body is constantly remodeling — taking old pieces of bone and replacing them with fresh bone. Your skeleton knows just what it needs to do to keep you up and running.