This phenomenon is called negligible senescence . In the 1990s, biologist Daniel Martinez conducted a now-legendary experiment. He placed hydras in a lab environment, eliminating predators and ensuring perfect nutrition. For four years—a human lifetime for these creatures—he watched them. They did not weaken. Their reproductive rate did not decline. Their cells did not show the usual signs of wear and tear, like telomere shortening (the "caps" on our chromosomes that fray as we age). In fact, statistical models suggested that under ideal conditions, a hydra has a constant, low probability of death—meaning it does not die of old age. It could, theoretically, live forever.
In the hydra, we see a mirror. Zoology reminds us that death is not a failure of biology, but a sophisticated invention. Aging may be the evolutionary price we pay for having a childhood, for learning, for building a heart that can break and a mind that can wonder why we must die. zoologia
The hydra has no brain, no complex organs, no social bonds, no "self" to lose. It is a simple tube of cells with a mouth surrounded by tentacles. Its eternal life is possible precisely because it is so simple. Complexity—the intricate lungs of a bird, the neurons of a human brain, the specialized liver of a mammal—comes with a price: planned obsolescence. Our bodies must age because our cells must specialize, and specialization leads to wear. This phenomenon is called negligible senescence