Summary: Maintaining normal blood pressure, avoiding diabetes, and not smoking between roughly ages 48 and 68 is associated with nearly 13 additional years of life free from dementia, according to a long-term community study.
The research also found consistent differences across sex and race: women lived longer without dementia than men at comparable risk levels, and white participants had more dementia-free years than Black participants with similar vascular risk profiles. While the presence of all three risk factors—hypertension, diabetes, and current smoking—was linked to earlier dementia onset and shorter dementia-free survival overall, the magnitude of that impact differed across demographic groups.
Key Facts
- Nearly 13-Year Gain in Dementia-Free Life: People who were free of high blood pressure, diabetes, and smoking during midlife (ages ~48–68) lived, on average, almost 13 more years without dementia than those who had all three risk factors (about 30 years versus 17 years from baseline).
- Large, Long-Term Cohort: The analysis included 12,409 adults (average baseline age 56) followed for an average of 26 years. During follow-up, 3,008 participants developed dementia and 5,238 died without dementia.
- Sex Differences: Across comparable risk categories, women maintained longer dementia-free survival than men (for example, women with all three risk factors averaged 18.1 dementia-free years versus 16.6 years for men).
- Racial Disparities: Among participants with the three vascular risk factors, white individuals averaged 19.6 dementia-free years while Black individuals averaged 16.0 years, highlighting the need for focused prevention in more vulnerable groups.
- Critical Midlife Window: The findings emphasize midlife—roughly ages 48 to 68—as an important period when controlling vascular risks may protect cognitive reserve and delay dementia onset later in life.
Source: NYU
Maintaining normal blood pressure, avoiding diabetes, and not smoking between ages 48 and 68 is associated with nearly 13 additional years of dementia-free life, a new long-term study reports.
Led by researchers at NYU Langone Health, the study examined how three common, modifiable vascular risk factors measured in midlife relate to dementia-free survival across decades. The results show strong associations between midlife vascular health and the timing and duration of dementia-free life later on.
Published online Aug. 5 in the journal Neurology, the study reports that midlife hypertension, diabetes, and smoking were each linked to both an earlier onset of dementia and fewer overall dementia-free years. The strongest contrast was between people with none of these risk factors and those with all three.
“Our findings argue that people need to actively avert these factors in midlife as a strategy for preserving brain health for more than a decade,” said Josef Coresh, MD, PhD, founding director of the Optimal Aging Institute at NYU Langone and the study’s senior investigator. He noted the public health importance given the high lifetime risk of dementia: many adults face a substantial chance of developing cognitive decline after age 55.
The analysis used data from the community-based Atherosclerosis Risk in Communities (ARIC) Study, which began in 1986 and tracked participants across decades into late life. For this report the team included 12,409 people who were dementia-free at baseline and whose midlife status for high blood pressure, diabetes, and smoking was recorded. Participants were followed for an average of 26 years.
Over follow-up, 3,008 participants developed dementia and 5,238 died without dementia. Those who had no midlife risk factors lived an average of about 30 years from the study’s start before a dementia diagnosis or death, compared with about 17 years among people who had all three risk factors—an average difference of nearly 13 dementia-free years.
The investigators examined outcomes across demographic groups. Women with all three risk factors averaged 18.1 years of dementia-free survival from baseline, while men with the same risk profile averaged 16.6 years. Among participants with all three risk factors, white individuals averaged 19.6 dementia-free years versus an average of 16.0 years for Black individuals.
“These results suggest that vascular risk reduction may benefit everyone, but certain populations—such as Black adults—may gain especially large benefits from targeted prevention efforts,” Dr. Coresh said. He encouraged people to stop smoking and to monitor and manage blood pressure and blood sugar starting in midlife.
The authors caution that the study shows strong prospective associations but does not prove that avoiding these midlife vascular risks directly causes the delay in dementia, since the design is observational. Another limitation is that risk factors were assessed at baseline only, so changes in treatment or behavior over time were not captured.
Funding: The research was supported by grants from the National Institutes of Health (including K24HL152440 and K01DK138273). The ARIC study received funding from several NIH cooperative agreement grants.
Study authors include lead author Jiaqi Hu (Institute for Hospital Management, Tsinghua University); Jason Smith (University of North Carolina); A. Richey Sharrett, Elizabeth Selvin and Michael Fang (Johns Hopkins Bloomberg School of Public Health); Rebecca F. Gottesman (National Institute of Neurological Disorders and Stroke); Pamela Lutsey (University of Minnesota); Thomas H. Mosley Jr. (University of Mississippi Medical Center); Jordan Weiss and Josef Coresh (NYU Grossman School of Medicine and the Optimal Aging Institute).
Key Questions Answered
A: Hypertension, diabetes, and smoking in midlife produce cumulative damage to the brain’s small blood vessels and tissue. Over years, reduced blood flow, chronic inflammation, blood-brain barrier disruption, and small vessel disease lower cognitive resilience and can accelerate the buildup of pathological proteins, increasing the risk of clinical dementia later in life.
A: Even with the same three vascular risk factors, Black participants had shorter dementia-free lifespans than white participants. The authors note this likely reflects broader influences such as systemic healthcare disparities, social determinants of health, and differences in baseline disease severity that amplify the cognitive impact of vascular risks in certain communities.
A: The study identifies a robust association rather than direct causation. Because risk factors were measured at a single baseline assessment, the observational design cannot fully capture how treatment or lifestyle changes over time affect dementia trajectories. Still, the long follow-up supports midlife risk reduction as a promising prevention strategy.
Editorial Notes
- This article was edited by a Neuroscience News editor.
- The journal article was reviewed in full.
- Additional context was added by editorial staff.
About this dementia and aging research news
Author: David March
Source: NYU
Contact: David March – NYU
Image credit: Neuroscience News
Original Research: Findings published in Neurology.