The Immortal Creature: How the Turritopsis Jellyfish Defies Aging

When people think about long-lived animals, creatures such as sea turtles that can survive for more than a century or whales that may live for two or three hundred years often come to mind. Compared with these organisms, the average human lifespan of roughly seventy or eighty years seems relatively short. Throughout history, many individuals have searched for ways to extend life, hoping to discover a secret that could delay aging or even achieve immortality. Scientists have long been fascinated by the fundamental question of why organisms age and die, devoting extensive research to uncovering the biological mechanisms behind these processes. Despite these efforts, many mysteries remain unresolved. Yet while humanity continues to investigate the nature of aging, one remarkable organism already possesses a biological trait that appears to fulfill the ancient dream of immortality: the jellyfish Turritopsis nutricula.

The so-called “immortal jellyfish” is extremely small and belongs to the class Hydrozoa within the phylum Cnidaria. In its early stage, the medusa is tiny, with a bell diameter of about one millimeter and typically eight to twelve tentacles. After roughly one month, the animal reaches sexual maturity. At this stage it grows larger, reaching about five millimeters in diameter, and the number of tentacles can exceed sixteen. Although the species was first discovered in the Caribbean in 1880, it was not until more than a century later, after 1992, that scientists realized it possessed an extraordinary biological ability: it can repeatedly reverse its life cycle, transforming from a sexually mature stage back into a juvenile state.

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