Summary
Highlights
Unlike most living beings, lobsters don't seem to age. Their cells continuously divide without showing signs of decay, a phenomenon that goes against fundamental biological principles. This raises questions about why lobsters are an exception and what happens when they live for an extended period.
Lobsters produce an enzyme called telomerase throughout their lives. In most animals, telomerase activity ceases in adulthood, leading to the shortening of DNA tips (telomeres) with each cell division, which causes aging and cell death. However, lobsters' continuous telomerase production keeps their telomeres intact, allowing their cells to divide efficiently and avoid age-related breakdown. This is why they don't experience typical aging, fertility decline, or age-related diseases.
Despite their cellular immortality, lobsters face a unique challenge: their exoskeleton. To grow, they must shed this hard outer shell through a process called molting. As lobsters get older and larger, molting becomes increasingly difficult and energy-intensive. Failure to molt properly can lead to the lobster getting trapped, becoming vulnerable, or simply running out of energy to complete the process. Ironically, molting is also the only time lobsters can mate.
Lobsters exhibit astonishing growth. A 50-year-old lobster can grow to over 70 cm and weigh more than 20 lbs. To put this in perspective, if humans grew like lobsters, a 50-year-old would be almost 300 meters tall and weigh over 3,000 tons. This immense size eventually becomes impossible for lobsters to maintain, making survival difficult.
Lobsters don't die of old age, but rather because their continuous growth leads to a physical limit. As they age, molting cycles become longer and more infrequent. Eventually, some lobsters stop molting altogether, their bodies too drained to complete the process. Stuck in an old, rigid shell, they become susceptible to infection, stress, and internal collapse, despite their biology still being ready to function. Autopsies of large lobsters show shell disease, muscular deterioration, and organ strain.
Rare giant lobsters, like one caught in 1977 weighing over 44 lbs and estimated to be 100 years old, represent the extreme end of this growth. While impressive, these massive lobsters are often at a tipping point, showing signs of wear and tear, and are one failed molt away from death. Even George, a lobster reportedly 140 years old, was nearing his natural end due to his inability to molt successfully. Lobsters don't age out, but rather max out, with an average lifespan of 31 years for males and 54 for females. Their rule is simple: if they can't molt, they can't live.