What animals live long lives?

Some varietys of turtles live for hundreds of years

edit:

Turritopsis nutricula, is a species of jellyfish that is theoretically immortal. The jellyfish can, in effect, revert back to a polyp state (ie. the equivalent of a human adult becoming a child once more). The jellyfish essentially reabsorbs parts of itself before spawning a bunch of new polyps similar to how bacteria replicate. It is possible that there is a jellyfish out there that is the ancestor of the whole species.