Skoltech scientists used a mathematical model to identify the main biological limits on human lifespan. They found that somatic mutations and non-renewing tissues—particularly neurons and cardiomyocytes—are the primary constraints, reducing a hypothetical non-aging median lifespan to about 156 years. The team plans to investigate reversible aging processes (mitochondria, telomeres, epigenetics, proteostasis) to guide future therapies.
Russian Model Suggests Human Lifespan Could Theoretically Reach 156 Years
Researchers found what's preventing us from living longer.
Researchers at the Skoltech Biomed Technologies Center in Russia used a mathematical model to explore which biological mechanisms most limit human lifespan. By selectively "switching on" and "switching off" different aging processes, the team estimated how long humans might live if overall mortality risk did not rise with age.
Key Findings
The model identified two primary constraints on extreme longevity: the accumulation of somatic mutations and the presence of non-renewing tissues. Somatic mutations are DNA changes that occur in cells during a person’s life; they build up over time and are not currently reversible with medical therapies. Many organs, like the liver and skin, regularly replace damaged cells. But neurons (brain cells) and cardiomyocytes (heart muscle cells) largely cannot divide and regenerate, making them especially vulnerable to irreversible decline.
"The key finding of the study is the discovery of substantial differences between tissue types. Neurons and cardiomyocytes, which lack the ability to divide, turned out to be the main limiting factors: when all other causes of aging are eliminated, somatic mutations alone reduce the theoretical median lifespan from 1,759 years (for a hypothetical non-aging human organism) to 156 years," said Evgeny Efimov, a research intern at Skoltech Biomed Technologies Center and a lead author on the paper.
Implications
According to the model, even if regeneration in the brain and heart were possible, the continuous accumulation of DNA errors across tissues would still block truly indefinite lifespans. In the authors' scenario, removing all other aging causes left somatic mutations as the dominant limiter, producing a theoretical median lifespan of about 156 years compared with 1,759 years for an otherwise non-aging organism in the model.
Next Steps for Research
With somatic mutation limits mapped out, the researchers say they will focus on aging processes that might be reversible or treatable. Promising targets include mitochondrial dysfunction, telomere shortening, epigenetic drift, and loss of proteostasis. The goal is to prioritize mechanisms that are both biologically important and realistically addressable by future therapies.
Practical Takeaways
While these theoretical limits are of scientific interest, current, evidence-based steps remain the most effective ways to improve health and longevity: follow your physician’s guidance, maintain a balanced diet, get adequate sleep, exercise regularly, and ensure a healthy living environment with clean air and water. Improving healthspan—years lived in good health—remains a central, achievable aim for aging research and clinical care.
Source: Skoltech Biomed Technologies Center study (reported in secondary coverage).
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