The Immortal Jellyfish: A Creature That Reverses Aging

Turritopsis dohrnii, known as the “immortal jellyfish,” can reverse its aging process by transforming back into its juvenile form when injured or stressed.

Key Points

Performs cellular transdifferentiation, turning mature cells into younger ones.

Returns to the polyp stage, essentially restarting its life cycle.

Not truly unkillable—but biologically, it can avoid natural aging indefinitely.

Used as a model organism in aging and longevity research.