You can learn more about this immortal animal in our latest video.
An update to the chart - this fish (a Greenland shark):
Reaches sexual maturity at 150 years - and lives to be at least 272 years old. That’s older than any other known vertebrate - but in theory, it still has nothing on the hydra.
Image Credit: Julius Nielsen/Science
The fountain of youth has been staring at us this whole time—it’s the ocean!