What animal has the longest life span?

The Greenland shark (Somniosus microcephalus) is the longest-lived vertebrate animal known to science. Radiocarbon dating of proteins in the shark’s eye-lens nuclei suggests that some individuals may be more than 500 years old. Primarily inhabiting the frigid and deep waters of the Arctic Ocean and the North Atlantic, the species has developed an exceptionally slow growth rate and metabolism, adaptations that are believed to underlie its remarkable longevity.