400-year-old shark
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The 400-year-old shark and other really old things

13 August 2016 Last updated at 14:35 BST

Scientists studying Greenland sharks reckon the fish can live for up to 400 years!

That makes them the world's longest-living vertebrates - or animals with spines.

So we've been taking a look at some of the other ancient living things that we share the planet with.