How Long Do Lobsters Live? The Truth Behind the “Immortal Lobster” Myth

You’ve probably seen the social media post. It goes something like this: “Lobsters are biologically immortal. They don’t age like other animals. They just keep growing until something kills them — and they only die because they get too big to molt or a predator eats them.”

It’s a fascinating idea, which is why it has millions of shares on Facebook, Twitter, and Reddit. It’s also one of the most widely misunderstood biological claims about any animal on the planet. The truth about lobster aging is more interesting — and more surprising — than the myth.

By the end of this article, you’ll understand exactly what “negligible senescence” actually means, why lobsters are not immortal, and how long a lobster can really live under the right conditions.

The Origin of the Immortal Lobster Myth

Like most viral science claims, the lobster immortality story started with a kernel of truth. In the 1990s, researchers studying aging in various animals noticed something unusual about lobsters and other decapod crustaceans: they produce an enzyme called telomerase in most of their cells throughout their lives.

In humans, telomerase production drops off sharply after development. Our telomeres — the protective caps on the ends of our chromosomes — shorten with each cell division. When they get too short, cells stop dividing, and we experience the effects of aging. Lobsters, the argument goes, keep producing telomerase, so their cells can keep dividing indefinitely. Ergo, they don’t age.

The problem is that this is a massive oversimplification. Yes, lobsters produce telomerase. No, that does not make them immortal. There’s a lot more that goes into aging than just telomere length.

What Is Negligible Senescence?

Scientists use the term “negligible senescence” to describe animals that show no measurable age-related decline in reproductive capacity or physiological function. Lobsters are sometimes described this way, along with certain turtles, naked mole rats, and some deep-sea fish.

But here’s the crucial distinction: negligible senescence is not immortality. It means aging doesn’t follow the same pattern you see in humans or dogs. A lobster may not get arthritis, heart disease, or dementia the way an old dog does. But that doesn’t mean it lives forever.

In fact, several physiological processes in lobsters degrade with age. Their immune systems become less effective. Their ability to repair damaged tissue declines. And most importantly, the energy cost of molting becomes unsustainable as they get larger.

Why Molting Eventually Kills Them

This is the real reason lobsters don’t live forever. To grow, a lobster must molt — shed its hard exoskeleton and grow a new, larger one. A young lobster might molt 25 times in its first five years. A 10-pound lobster might molt once every two to three years.

Molting is incredibly energy-intensive. It takes weeks of preparation, during which the lobster stops eating and stores energy. During the actual molt, the lobster is vulnerable — soft, defenseless, and unable to eat. After molting, it must pump its body full of water to expand the new shell before it hardens, which takes additional energy.

As a lobster grows larger, the energy required for molting increases exponentially. A 20-pound lobster needs an enormous amount of stored energy just to survive the molt. Eventually, the math stops working. The lobster becomes too large to molt successfully. When it needs to molt to grow or repair its shell, it simply cannot. The exoskeleton becomes brittle, develops cracks, infections set in, and the lobster dies.

This is not “getting eaten” — this is aging. It’s a biological ceiling that every lobster faces.

For a deeper look at lobster biology, our guide to lobster anatomy explains how their unique body structure makes molting both possible and perilous.

The Oldest Lobsters on Record

Even without immortality, lobsters can live a surprisingly long time. The oldest reliably documented lobster was named George. Caught off the coast of Newfoundland in 2008, George weighed 20 pounds and was estimated to be 140 years old. He was released back into the wild after a campaign by People for the Ethical Treatment of Animals (PETA).

Other notable old lobsters include:

• Larry the Lobster: Caught in Maine in 2016, weighing 27 pounds. Estimated age was over 100 years. He was released into a marine sanctuary.
• A 22-pound lobster caught in Maine in 2023 estimated to be 80 to 100 years old.
• A 44-pound lobster caught in Nova Scotia in 1977 — the heaviest recorded — estimated age of 100+ years.

But here’s what’s important: these are the exceptions, not the rule. Most lobsters in the wild never reach old age. They’re caught by fishermen, eaten by predators like cod, seals, and octopuses, or die from disease and injury. A lobster that reaches 50 years old has beaten extraordinary odds.

How Scientists Determine Lobster Age

One reason the immortality myth persists is that it’s genuinely difficult to determine a lobster’s age. Unlike trees, lobsters don’t have obvious growth rings. They shed their entire exoskeleton every time they molt, taking any accumulated markers of age with it.

For years, scientists relied on size as a rough proxy for age — bigger lobsters are generally older. But this is imprecise, because growth rates vary dramatically based on water temperature, food availability, and genetics. A lobster in cold Maine waters grows much slower than one in warmer waters, meaning a 5-pound Maine lobster might be significantly older than a 5-pound lobster from a warmer region.

More recently, researchers have developed a method using lipofuscin — a pigment that accumulates in nerve tissue over time. By extracting a small sample of a lobster’s eyestalk (where key nerve bundles are located) and measuring lipofuscin levels, scientists can estimate age with much greater accuracy. This technique has revealed that lobsters may live even longer than previously thought — possibly exceeding 100 years for large specimens.

The Telomerase Question: What It Actually Means

Let’s circle back to the telomerase issue, because it’s the heart of the myth. Yes, lobsters produce telomerase in their cells throughout their lives. This likely contributes to their remarkable longevity compared to mammals of similar size. But telomerase doesn’t stop other forms of cellular damage.

Oxidative stress, protein aggregation, mitochondrial dysfunction — these processes happen in lobsters just as they happen in humans. Lobsters don’t have special mechanisms to prevent them. The telomerase gives them an advantage in one specific domain (telomere maintenance), but they’re still subject to the same fundamental wear and tear that limits the lifespan of every living thing.

Think of it this way: telomerase is like having a car with a tire that never wears out. That’s great for the tires, but the engine will still fail eventually.

Lifespan in Captivity vs. the Wild

Lobsters in captivity often outlive their wild counterparts, simply because they’re protected from predators and have a reliable food supply. But they still face the molting problem. Even with optimal care, the largest captive lobsters eventually reach a size where molting becomes too dangerous.

Aquariums that hold large lobsters often keep them in specially designed tanks with soft surfaces and controlled conditions to minimize the risk of injury during molting. Even then, the oldest known captive lobsters have only reached about 50 years — far short of George’s estimated 140.

Interestingly, the stress of captivity can shorten a lobster’s life. Lobsters shipped and handled frequently show elevated stress hormones (yes, they have them), and stressed lobsters are more susceptible to shell disease and other infections.

Do Lobsters Die of “Old Age”?

Technically, no — or at least not in the way humans do. Lobsters don’t develop organ failure from aging the way a mammal does. Instead, they die from the consequences of a failed molt, from infection after their shell becomes compromised, or from the sheer energy exhaustion of trying to maintain a massive body.

But calling that “not aging” is like saying a marathon runner doesn’t get tired because they don’t fall asleep mid-stride. It’s a different failure mode, but it’s still aging. The lobster’s body deteriorates. Its systems become less efficient. The accumulated damage of decades eventually catches up.

For more fascinating science about these creatures, check out our guide to rare lobster color genetics — another area where the reality is more interesting than the myth.

The Bottom Line

Lobsters are extraordinary animals with a genuinely unusual aging process. The telomerase production that fuels the “immortal lobster” myth is real, but it’s only one piece of a much more complex biological puzzle. Lobsters don’t live forever. They don’t even live as long as humans. A 140-year-old lobster is exceptional, not typical.

The real lesson of lobster biology isn’t that they’ve found a way to cheat death — it’s that evolution has produced many different strategies for surviving, and lobsters have one that works remarkably well, even if it has its limits.

Ready to experience one of nature’s most fascinating creatures for yourself? Order lobster and taste the result of 100 million years of evolution.