Avoiding Three Vascular Risks in Midlife Linked to 13 More Dementia-Free Years

A study published August 5 in Neurology Open Access tracked 12,409 U.S. adults for approximately 26 years to examine how midlife vascular health relates to years lived without dementia. Participants were dementia-free at enrollment with an average age of 56. Researchers recorded whether each person had high blood pressure, diabetes, or smoked — three major modifiable risk factors for dementia — and followed cognitive outcomes through periodic testing and phone interviews.

Over the follow-up period, 3,008 participants developed dementia and 5,238 died without dementia. Individuals who had all three risk factors at midlife were 2.7 times as likely to develop dementia as those with none. Those who avoided all three risk factors averaged 30.1 dementia-free years, compared with 17.5 years for those with all three, a difference of about 12.6 years.

The study also found incremental benefits: avoiding just one risk factor was associated with an estimated four additional dementia-free years, while avoiding two added about nine years, relative to having all three. The authors emphasized that the analysis shows an association, not proof that avoiding these factors directly causes the delay. Other influences such as diet, genetics, and environmental pollution also affect cognitive decline risk.

Experts not involved in the research said the time-based framing makes the findings more tangible for the public. Jacqui Hanley of Alzheimer's Research U.K. noted that asking how many healthy years people can expect is a meaningful way to communicate risk. Study co-author Josef Coresh of NYU Grossman School of Medicine said avoiding a few risks in midlife yields more than a decade free of both dementia and death.

Clinicians highlighted that midlife remains a critical window for intervention. Heather Whitson of Duke University School of Medicine said starting early may be the best chance to address dementia, which has no known cure. Anna Nordvig of Weill Cornell Medicine added that age 55 is still a great time to improve vascular health and slow cognitive decline, even if risk factors are already present.

More than seven million Americans currently live with Alzheimer's disease, the most common form of dementia, accounting for up to 80 percent of cases. The study's observational design cannot establish causation, and researchers acknowledged that improving heart health is not a fix-all. However, with no cure available, modifying vascular risk factors remains one of the few evidence-based steps people can take to protect brain health as they age.