A new study suggests that narrowing the gap between a person’s biological age and chronological age may be associated with better brain health and a lower risk of stroke. Researchers say the findings highlight how lifestyle and metabolic health may influence the aging process and long-term neurological outcomes.
The research, presented ahead of the American Academy of Neurology’s 2026 Annual Meeting, analyzed health data from more than 250,000 people to examine how biological aging relates to brain health and stroke risk.
Biological age reflects how well the body’s systems are functioning compared with a person’s actual chronological age. Scientists calculate it using biological markers such as cholesterol levels, blood cell measurements, and inflammation indicators.
Large Study Examines Aging and Brain Health
Researchers evaluated the biological age of 258,169 participants using 18 blood biomarkers and tracked their health outcomes for an average of about 10 years. A smaller subset of participants also underwent brain scans and cognitive testing.
At the start of the study, participants had an average biological age of 54 years compared with an actual age of 56. Six years later, their average biological age rose to 58 while their chronological age increased to 62.
The findings showed a strong relationship between biological aging and brain health indicators.
Participants whose biological age was older than their chronological age showed less favorable brain scans, poorer performance on cognitive tests, and a 41 percent higher risk of stroke during the follow-up period.
By contrast, people who reduced their biological age gap over time were 23 percent less likely to experience a stroke than those whose biological age gap remained the same or worsened.
Signs of Reduced Brain Damage
Brain scans also revealed differences in structural health. Participants who reduced their biological age gap had lower white matter hyperintensity volumes, a marker of damaged brain tissue often linked to aging and vascular disease.
Researchers found that the total amount of such brain damage was about 13 percent lower for each standard improvement in the biological age gap.
However, scientists emphasized that the research demonstrates an association rather than a direct cause-and-effect relationship between improvements in biological age and better brain health.
Lifestyle Factors May Influence Biological Aging
Although the study did not directly test specific lifestyle programs, researchers say everyday habits could influence biological aging.
“Lifestyle habits that support cardiovascular and metabolic health, like a healthy diet, regular exercise, adequate sleep, and good blood pressure control, may help narrow the biological age gap,” said study author Dr. Cyprien Rivier of Yale University.
These findings align with growing research suggesting that biological aging may be modifiable through lifestyle and health management. Biological age measurements are increasingly studied using tools such as epigenetic clocks, which estimate aging based on molecular changes in DNA.
Growing Interest in Biological Aging Research
Scientists are increasingly focusing on biological aging as a potential predictor of long-term health outcomes. Some studies have shown that accelerated biological aging may be linked to cognitive decline and other chronic diseases.
Researchers say understanding how to slow or reverse biological aging could open new paths for preventing conditions such as stroke, dementia, and other age-related diseases.
For now, experts emphasize that maintaining cardiovascular health, staying physically active, and getting adequate sleep remain some of the most practical steps people can take to support healthy aging and brain function.
