A Piece-by-Piece Look at How Old a Human Body Really Is

The NPR series Skunk Bear took a piece-by-piece look at how old different parts of a human body are to answer the question "How Old Is Your Body, Really?"

Do all of your cells get switched out for new ones every seven years or so? Does anything remain with you throughout your entire life?

That's the question posed on the NPR podcast Invisibilia by co-host Lulu Miller.

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