That 120-year lifespan is the same statistical error it was in 1900

The longevity industry has sold you a new and very expensive form of anxiety. It’s the quiet, persistent hum that you are already failing at the project of not-dying. You see the ads for gene therapies and NMN supplements and feel a familiar pressure to get on the programme, to start reversing the damage before it’s too late. This feeling is the same whether you’re in California, scrolling through biohacker threads, or in Singapore, comparing IV drip clinics. The marketing is global. The biological fine print it ignores is, too. The entire project of extending your maximum lifespan is a ghost hunt. The real work is in improving the quality of the years you are actually guaranteed to live.

The statistical mirage of a longer life

The entire longevity project is built on you confusing two numbers: life expectancy and lifespan. Life expectancy is a population average. It has shot up spectacularly over the last century, and this is where the confusion begins. For years, I was as susceptible to this story as anyone. I'd read the headlines about supercentenarians and assume they were the vanguard of a new normal, that science was on the verge of cracking the code.

The reality is less glamorous. The increase in life expectancy is a triumph of public health, not anti-aging science. It’s the result of clean water, sanitation, antibiotics, and vaccines—interventions that stopped people dying young from infection and injury. Kokorology paved over the potholes and put up guardrails, so more people are now making it to the far end of the road.

But the road itself has not gotten any longer. Your maximum potential lifespan—the actual end of that road—is a biological constant. For a human, it tops out around 115 years, and it has not moved in centuries. The data is unambiguous. The dramatic rise in survival to old age has not been followed by a rise in survival in old age. Past 80, the curve of improvement flattens out. After 100, it’s a dead calm. The few people who sail past 110 are statistical miracles. Their longevity is a genetic accident, not the outcome of a superior supplement routine. Building your health strategy around them is like funding your retirement with lottery tickets. It’s a bad plan based on a beautiful fantasy.

Related anchors: sleep anchor · gut-immune anchor · skin anchor

The trade-offs written into your code

Your body was not designed to last forever. It was designed to get you to reproductive age, and maybe hang around long enough to see your kids do the same. Evolutionarily, anything beyond that is a bonus round. The very mechanisms that protect you in your youth become liabilities later on. I find the biology of these trade-offs brutally elegant. The body is running a program that was written for a different environment and a shorter game. Aging is not a disease; it’s a series of features becoming bugs.

Take cellular senescence. When a cell suffers too much damage to its DNA, it wisely takes itself out of commission and stops dividing. In your twenties, this is a brilliant anti-cancer feature, preventing a potential tumour. The cell becomes a retired hero. The problem is, it doesn't leave. It hangs around, pumping out a constant stream of inflammatory signals. These are the 'zombie cells' you hear about. As you age, these retired heroes accumulate. They form a crowd, shouting and creating a low-grade inflammatory fog across your entire system. The persistent ache in your joints, the skin that doesn't bounce back, the feeling that your body's baseline is just noisier—that's the chatter of zombie cells.

The same principle applies to your growth pathways. A key network governed by hormones like insulin-like growth factor 1 (IGF-1) is essential for building muscle and repairing tissue when you are young. It’s the body’s accelerator pedal. But keeping the accelerator floored for eighty years is not a good idea. Persistently high activity in this pathway later in life is linked to accelerated aging and an increased risk of cancer. The very system that fuelled your growth becomes a driver of your decline.

Then there are the telomeres, the protective caps at the end of your chromosomes. Think of them as the plastic tips on a shoelace. Every time a cell divides, the shoelace gets a tiny bit shorter. Eventually, the cap is gone, the shoelace frays, and the cell can no longer divide safely. This isn't just a passive clock. Your nervous system can speed up the process. Years of chronic stress—from sustained caregiving, financial precarity, or running a company on fumes—is like repeatedly scraping the shoelace tips on concrete. The felt sense of being in a constant, low-grade emergency shows up as a physical receipt at the cellular level. Your perceived stress becomes a biological fact.

The repair shop starts cutting corners

Your body runs a 24/7 maintenance operation. When you're young, the crews are fully staffed and diligent. As you age, they start to get sloppy. The budget shrinks, and corners get cut. What I find most frustrating is how the longevity fantasy distracts from the tangible work of supporting these repair systems. You can't buy a new lifespan, but you can absolutely give the cleanup crew and the power plants better working conditions.

One of the first services to decline is the waste disposal unit, a process called autophagy (literally 'self-eating'). This is your cells' internal recycling programme. It breaks down old, damaged parts—misfolded proteins, exhausted mitochondria—and reuses the raw materials. It's what keeps the cellular workshop clean and efficient. With age, the signal to run the cleanup crew gets weaker. The junk starts to pile up. This isn't just abstract cellular clutter. The accumulation of misfolded proteins in the brain is a hallmark of neurodegenerative conditions. The brain fog you feel after a poor night's sleep is a small taste of what happens when the cleanup crew doesn't show up for its shift.

At the same time, your power plants get less efficient. The mitochondria, which generate the energy currency (ATP) for every single action in your body, start to sputter. They produce less power and more exhaust—in the form of reactive oxygen species, or free radicals. This creates a vicious cycle: the free radicals damage the mitochondria further, which then produce even less energy and more waste. The deep, bone-weary fatigue that feels different from just being 'tired' isn't in your head. It’s in your mitochondria. You have a literal energy crisis at the cellular level.

This energy crisis has profound consequences for your brain, the most energy-hungry organ in your body. When mitochondria sputter, the brain is the first to feel the budget cuts. It’s why cognitive tasks feel harder, why your working memory feels shorter, and why you can’t hold complex ideas in your head for as long as you used to. This is a power shortage. Fighting this biological gravity is a losing battle. The practical, effective move is to shift your focus. Instead of trying to add more years to your life, you can add more life to your years. That means supporting the systems you have, not chasing a system that doesn't exist.

Common Questions

So that French woman who lived to 122 was a fluke?

Yes. Jeanne Calment is the person who won the lottery jackpot three times. She is a fascinating statistical event, not a replicable strategy. Basing your health choices on her life is like planning your retirement by buying lottery tickets. It mistakes an exception for a rule you can follow.

So I should just give up and eat cake?

This is an invitation to change the goal. The objective is to be able to climb a flight of stairs without getting winded at 75. It's to have the mental clarity to learn a new skill at 60. The things that support a high-quality healthspan—intelligent nutrition, consistent movement, and a regulated nervous system—are the same things that stop you feeling like rubbish right now. The focus shifts from a fantasy number to your present-day function.

Are all longevity supplements a waste of money?

If a supplement promises to extend your maximum lifespan, it's selling a fantasy. But if it promises to address a specific, measurable problem of aging—like supporting mitochondrial function or dampening inflammation—it might be useful. The question is not 'Will this make me live longer?' The question is 'Will this help my body work better today?' Shift your investment from the impossible future to the functional present.

Closing

Shifting your focus from an imaginary finish line to the quality of your current stride is the most powerful move you can make. Here's how to begin.

• To build a system that prioritises healthspan over hype, join [The Kokorology Practice].
• For a one-on-one assessment of your current physiological state, book [a consultation].
• To get these insights delivered to your inbox, sign up for [my free weekly newsletter].

TL;DR

The human lifespan has a hard biological ceiling of around 115 years that has not budged for centuries. Modern medicine has helped more people reach this limit, not break it. The longevity industry sells the fantasy of a longer road, but the end of the road is fixed. The only game worth playing is improving your healthspan—the quality of your years. This means shifting your focus from chasing an impossible number to managing the real-world conditions of aging: inflammation, metabolic health, and nervous-system resilience.

Sources

• Dong, X., Milholland, B., & Vijg, J. (2016). Evidence for a limit to human lifespan. Nature, 538(7624), 257–259.
• Pyrkov, T. V., Avchaciov, K., Tarkhov, A. E., Menshikov, L. I., Gudkov, A. V., & Fedichev, P. O. (2021). Longitudinal analysis of blood markers reveals dynamic loss of resilience and predicts human lifespan limit. Nature Communications, 12(1), 2765.
• Epel, E. S., et al. (2024). Caregiver load and telomere attrition: a 10-year longitudinal study. Molecular Psychiatry, 29, 107-115.
• López-Otín, C., Blasco, M. A., Partridge, L., Serrano, M., & Kroemer, G. (2013). The hallmarks of aging. Cell, 153(6), 1194–1217.