Which is the longest-living animal?

Among animals with a measurable lifespan, the ocean quahog, a type of clam, is a record-holder — one individual nicknamed “Ming” was found to be 507 years old. The Greenland shark is the longest-lived vertebrate, estimated to live between 300 and 500 years, reaching sexual maturity only around age 150. Certain deep-sea corals and sponges may live for thousands of years. Most remarkable is the tiny jellyfish Turritopsis dohrnii, which can revert to an earlier life stage when stressed, potentially escaping death from old age altogether — earning it the nickname the “immortal jellyfish.”