Red sea urchin 'almost immortal': "'Some of the largest and we believe oldest red sea urchins up to 19 centimetres in size have been found in waters off British Columbia, between Vancouver Island and the mainland.
'By our calculations, they are probably 200 or more years old.
'They can die from attacks by predators, specific diseases or being harvested by fishermen. But even then they show very few signs of age. The evidence suggests that a 100-year-old red sea urchin is just as apt to live another year, or reproduce, as a 10-year-old sea urchin.'
In fact, the indications are that the more mature red sea urchins are the most prolific producers of sperm and eggs, and are perfectly capable of breeding even when incredibly old"