A coelacanth in a museum in France. It is believed they can live to be 100.

Research sheds more light on the giant ‘living fossils’ once thought extinct but which have survived since the age of the dinosaurs The coelacanth – a giant, mysterious fish that has survived since the time of the dinosaurs – can live for 100 years, a study has found.The slow-moving fish, which grow to be the…[…]

Mysterious coelacanth fish can live for 100 years – study — The Guardian