NYU Langone Health study links avoiding three midlife risk factors to 13 extra dementia-free years

A study led by NYU Langone Health finds that middle-aged adults who avoid high blood pressure, diabetes and smoking can gain nearly 13 additional years free from dementia, according to research published in Neurology Open Access. The Atherosclerosis Risk in Communities study, an ongoing trial that began in 1986, supplied the long-term health data behind the finding. The results set a number on a prevention window that researchers place between roughly age 48 and 68.

The core numbers

More than 12,000 dementia-free participants with an average age of 56 were followed for an average of 26 years. By the close of that observation period, 3,008 had developed dementia and 5,238 died without cognitive impairment. Participants who carried none of the three risk factors averaged 30 dementia-free years from their baseline exam. Those with all three conditions averaged 17 years before dementia onset or death.

Demographic breakdown

The data split along sex and racial lines. Women with all three risk factors averaged 18.1 dementia-free years after baseline; men with the same profile averaged 16.6. Among White participants carrying all three risks, the figure reached 19.6 years. For Black participants with the same health profile, it was 16.0 years.

Dr. Josef Coresh, senior investigator and founding director of the Optimal Aging Institute at NYU Langone, said the results point to broad benefit from vascular risk reduction across groups while indicating that Black adults may benefit particularly from targeted prevention efforts. He said the data should motivate people to quit smoking and begin monitoring cardiovascular health in their late 40s.

What the study cannot establish

The authors flagged several constraints worth keeping in mind. The observational design cannot prove direct cause and effect between midlife risk factor control and later cognitive outcomes. Health status was also recorded during a single visit, leaving some intervening lifestyle changes unreported.

Coresh cited a projection that roughly 42% of Americans will develop dementia after age 55, framing active risk management in midlife as a strategy for preserving brain function for more than a decade. The Atherosclerosis Risk in Communities study remains ongoing.