By Sushant Agarwal
Published on | May 21, 2025
Hydras don't appear to age and can regenerate endlessly, making them biologically immortal in lab conditions.
Known as the 'immortal jellyfish', it can revert to an earlier life stage, potentially escaping death indefinitely.
Among the longest-living animals, some glass sponges are believed to be over 10,000 years old.
These slow-growing deep-sea corals can live for more than 4,000 years.
One specimen of this deep-sea clam, found in 2006 off the coast of Iceland, was 507 years old—one of the oldest non-colonial animals known.
Found near hydrothermal vents, some tubeworms have been estimated to live over 300 years.
The Greenland shark, found in the deep North Atlantic, is the longest-living vertebrate known, with an estimated lifespan of 270 to over 400 years.
These filter-feeding mollusks can live up to 250-300 years in clean, cold rivers and streams.
Living in deep Pacific waters, these fish can survive for more than 200 years.
This Arctic giant is one of the longest-living mammals, often reaching over 200 years comfortably.
Found in the Pacific Ocean, red sea urchins are known to live over 100 years, with some exceeding 200.
These tortoises can live over 150 years. The oldest known is Jonathan, a 190-year-old tortoise living on St. Helena Island.
One of the longest-living reptiles, saltwater crocodiles can survive up to 70–120 years in the wild.