Lobsters' Unique Aging Process

Lobsters possess a remarkable biological trait known as negligible senescence, which means they largely escape the typical decline associated with aging in most other species. Unlike humans and many animals whose cells experience shortening telomeres—protective caps on DNA—with each division, lobsters have an enzyme called telomerase that is active across most of their tissues throughout their lives. This continuous supply of telomerase allows their cells to constantly repair and renew, enabling them to maintain muscle strength, organ function, and even fertility as they grow larger, rather than experiencing age-related deterioration.

However, this unique cellular regeneration does not grant them true immortality. Lobsters are still very much mortal, succumbing to a variety of environmental and physiological challenges. A primary cause of death is the molting process itself; as a lobster grows, shedding its rigid exoskeleton becomes increasingly difficult and energy-intensive. Older, larger lobsters are particularly vulnerable, with a significant percentage dying from sheer exhaustion during a molt. They are also susceptible to predators, diseases like shell rot, and injuries, especially when their new, soft shell is still hardening after molting.

Despite these vulnerabilities, some lobsters have been estimated to live for over a century, with the oldest known individuals reaching between 120 and 140 years of age. Scientists can even estimate a lobster's age by examining growth rings on their eye stalks and gastric mills, similar to tree rings. This extraordinary longevity, coupled with their continuous growth, has historically fueled myths of their immortality, a perception rooted in their unusual ability to seemingly defy the march of time.