Question: How long can a Catshark live for and what is the age when a juvenile becomes an adult?

Lesser-Spotted Catshark answered on 3 Nov 2017:

Males reach sexual maturity when they are about 50cm long and 6-7 years old. Females take a bit longer since it is more of a physiological challenge to produce eggs and reach sexual maturity when they are around 8 years old.

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!