A groundbreaking new study published Monday in Nature Medicine reveals that the risk of developing dementia is significantly higher than previous estimates, with nearly half of Americans facing the possibility of dementia later in life. This study, which tracks over two decades of data, has revised previous estimates, now suggesting that 42% of both men and women may develop dementia in their lifetimes.
“We believe this study will change how we approach dementia,” said Dr. Ted Huey, Director of the Memory and Aging Program at Butler Hospital, Rhode Island. “The findings are critical as they highlight the increasing prevalence of dementia due to longer life expectancies.”
The study, led by Dr. Josef Coresh, Director of the Optimal Aging Institute at NYU Grossman School of Medicine, found that the growing number of dementia cases is tied directly to longer lifespans. By 2060, the number of people living with dementia is expected to double. In particular, Black Americans—who face higher risks—are projected to see cases triple. Currently, about 10% of Americans over age 65 have been diagnosed with dementia, with nearly 7 million people in the U.S. living with Alzheimer’s, the most common type.
The research followed over 15,000 Americans, including more than a quarter who were Black and more than half who were women—groups known to have a higher risk. The study found that while the risk of dementia begins at age 55, it sharply increases after age 85. For those reaching 95, the lifetime risk climbs to 42%. Among Black Americans and women, the risk at 95 is even higher, reaching 42% and 48%, respectively.
Why is this risk so much higher than previous research suggested? Experts point to several factors. Older studies had limited participant diversity and may have missed key data from certain groups, including non-English speakers. Additionally, as people live longer, they accumulate more age-related conditions like hypertension, diabetes, and stroke, which increase the risk of developing dementia.
The study emphasizes that while not everyone will develop dementia, understanding the risk factors is key. Dr. Monica Parker of Emory University notes that lifestyle changes, such as controlling hypertension and diabetes, getting quality sleep, and maintaining a healthy diet, can help reduce the risk. “What’s good for the heart is good for the brain,” said Dr. Coresh.
As awareness grows about dementia’s rising threat, experts encourage the public to stay informed about the factors influencing the disease and take proactive steps to reduce risk. Early intervention and lifestyle changes may help safeguard cognitive health for the aging population.
Read more:
- A Comprehensive Guide to Dementia-Related Psychosis
- Is Dementia a Psychological Condition?
- The 5 Best Vitamins For Older Men
