Somewhat related: last year a study showed that the oldest living vertebrates are Greenland sharks, which can attain ages of 400-500 years: https://www.scienced

Somewhat related: last year a study showed that the oldest living vertebrates are Greenland sharks, which can attain ages of 400-500 years: https://www.sciencedaily.com/releases/2016/08/160811143218.htm https://www.sciencedaily.com/releases/2016/08/160811143218.h... Saw a documentary that mentioned this recently. Interestingly, these sharks are born with great eyesight, but nearly all of them that have been studied have these parasites (https://en.wikipedia.org/wiki/Ommatokoita https://en.wikipedia.org/wiki/Ommatokoita) embedded in their eyes that literally eat their corneas.