New Study Puts a Hard Number on the Maximum Human Lifespan

The 122-Year Ceiling Just Got Shattered — On Paper

For decades, scientists pointed to one woman as proof of how long a human being could possibly live. Frenchwoman Jeanne Calment, who died in 1997 at 122 years and 164 days, set the verified record that many aging researchers long regarded as the practical upper boundary of human longevity. Now, a new study is challenging that assumption — and the new number is startling.

A team of researchers has unveiled a new mathematical model suggesting humans could theoretically live up to 156 years if every reversible hallmark of aging were eliminated except one. Published in the journal npj Aging in July 2026, the paper was authored by Russian researchers Evgeniy Efimov, Vlad Fedotov, and Leonid Malaev, based at the Skolkovo Institute of Science and Technology.

The Culprit: DNA Errors You Can't Undo

Somatic mutations are changes that occur in the body's cells and accumulate throughout a person's lifetime because of environmental factors and errors in DNA replication. Over time, they contribute to aging and are thought to help limit the human lifespan. Unlike many other biological processes, these mutations are irreversible — and that's precisely what makes them so significant to longevity science.

The team used a multistage model in which aging mechanisms were switched on one after the other. The model started with a hypothetical "non-aging human" for whom increasing age is not a factor in mortality — and the median lifespan in that case stood at 1,759 years. The addition of somatic mutations alone caused that figure to collapse to 156 years. That's a dramatic illustration of just how much biological weight these DNA errors carry.

The finding offers the first quantitative ceiling on human longevity based solely on somatic mutations — the irreversible DNA errors that accumulate in our cells over time. Depending on the specific model used, the median lifespan ranged from 146 to 194 years.

Why Your Brain and Heart Are the Weakest Links

According to the study's authors, the tissues that cannot regenerate — the brain and the heart — are the ones that ultimately set that limit. This is a key distinction. Some organs, like the liver, can replace damaged cells over time, effectively resetting the damage clock. But neurons and heart muscle cells largely cannot.

As the study states, "post-mitotic cells such as neurons and cardiomyocytes act as critical longevity bottlenecks," with somatic mutations reducing the median lifespan from a theoretical non-aging baseline of 1,759 years down to 156 years. In contrast, proliferating tissues like the liver "maintain functionality for thousands of years through cellular replacement, effectively neutralizing mutation-driven decline."

A Thought Experiment — Not a Promise

This wasn't a prediction of how long people will live in the future. Instead, it was a thought experiment designed to estimate the upper limit that somatic mutations alone might impose, in order to improve our understanding of aging. The researchers themselves were careful to pump the brakes on any overly optimistic interpretations.

The findings are based on computational modeling rather than experimental evidence and do not suggest humans are close to reaching such ages. Still, the work has real implications for aging science and future therapeutic strategy, signaling that even the most advanced anti-aging interventions may hit a hard biological limit unless genomic damage can be controlled.

The researchers say they plan to expand their model to include other hallmarks of aging — a next step that could further refine just how negotiable, or immovable, our biological clock truly is. For now, the study reframes the conversation: the question is no longer simply how to slow aging, but whether science can one day address the deepest layer of damage written into our DNA itself.