This is the oldest animal on Earth: A good claim on immortality
Scientists found a deep sea animal that has lived at least 11,000 years, according to a study published in the journal Aging Research Reviews. A deep sponge belonging to the species Monorhaphis is the largest biosilica species on Earth with needle-like spicules measuring up to 10 feet (three meters) in length.
Researchers are fascinated by its age and record-breaking length as they try to understand how its biological functions work. They are hoping to understand how it is possible for a living creature to survive for such a long period of time. No other animal on Earth has a lifespan similar to that of this deep sea creature.