In the North Atlantic Ocean between Canada and Norway there lives a species of very long-lived sharks called Greenland or gray sharks.
Researchers believe that in 2017 they found one that was probably born in 1505, lived at the time of Anne Boleyn and Henry VIII, and is still alive!
Here is a short video from Wonder World explaining the phenomenal creature, which could be the oldest vertebrate alive:
In one of the Icelandic sagas, there is a story about a huge shark or whale that was probably a Greenland shark. The sagas were written about events that took place from the 9th century to the 12th century in Iceland, Norway, Greenland, and Labrador.
Given that the description of the creature they found said that it was huge, and that size indicates age in Greenland sharks, I wonder how old was the one referred to in the saga?