Question: what age does the sharks die at?

Lesser-Spotted Catshark answered on 7 Nov 2017:

Reports suggest that in the wild, catsharks can live about 12-13 years on average. To estimate the age of a shark, scientists count the number of rings which form in their vertebrae each year, kind of like counting tree rings.
One more fun fact is that the oldest living vertebrate ever recorded is a greenland shark (Somniosus microcephalus) which was shown to be over 400 years old using radiocarbon dating!