The animal that can live up to 1000 years is the glass sponge as well as the black coral, ocean quahog and the immoral jellyfish.
Glass sponges are considered to be the oldest, and one Antarctic specimen of a glass sponge is estimated to be as old as 15,000 years.
Some colonies of the black coral in the Gulf of Mexico are dated to be over 4,000 years old.
A ocean quahog, is a clam species that can live over 500 years, although some can potentially live longer in deeper and colder areas.
And immortal jellyfish are biologically immortal and can revert to a juvenile polyp stage and can potentially live forever.
Other creatures that can live long lives are giant barrel sponges and certain deep sea tube worms.
The immortal jellyfish also known as the Turritopsis dohrnii never technically dies of old age.
The Turritopsis dohrnii or immortal jellyfish is a tiny, 4.5 mm (0.18 inch) jellyfish that is found in the Mediterranean and worldwide.
The Turritopsis dohrnii jellyfish can technically achieve what is known as biological immortality through a process that is called transdifferentiation.
When the Turritopsis dohrnii jellyfish faces stress, physical damage or even starvation, the Turritopsis dohrnii jellyfish can revert it's mature cells back into young cells and technically be immortal and not die.
The Turritopsis dohrnii jellyfish has the ability to do a life cycle reset, where it transforms from it's adult medusa stage, back into a juvenile polyp stage, and essentially starts it's life over again.
And although the Turritopsis dohrnii jellyfish can repeat this process indefinitely, immortal jellyfish can still die from disease or even being eaten by it's predators.
Turritopsis dohrnii (the "immortal jellyfish") does actually die frequently, despite being biologically immortal.
While they can reverse their life cycle to avoid death from old age, they are still easily killed by predators, disease, or environmental dangers.
They only cheat death by aging, not by physical destruction.
Most T. dohrnii die from being eaten by predators like fish and turtles or by contracting diseases or facing harsh conditions in the ocean.
And while the immortal jellyfish can start over, they are not completely immune to dying or death, which means that their population is controlled naturally.
If the immortal jellyfish does not get diseased or eaten they can technically live forever.
But like mentioned above, many of the immortal jellyfish do get eaten by predators or die eventually of some diseases.