Study Links Optimism to Lower Dementia Risk in Older Adults

A new study has found that older adults with higher levels of optimism face a significantly lower risk of developing dementia, offering fresh evidence that a positive outlook may support brain health in later life.

Researchers from the Harvard T.H. Chan School of Public Health analyzed data from the Health and Retirement Study, a long-term national survey of U.S. adults aged 50 and older. The investigation, published April 8, 2026, in the Journal of the American Geriatrics Society, followed 9,071 cognitively healthy participants with an average age of 74 for up to 14 years, from 2006 to 2020. Optimism was measured using the Life Orientation Test-Revised, a validated questionnaire with scores ranging from 6 to 36, where higher scores indicate greater expectation of positive outcomes. Dementia diagnoses were determined through an algorithm incorporating cognitive tests, physical health indicators, demographics and social engagement.

The results showed that each one-standard-deviation increase in optimism, equivalent to about six points on the scale, was associated with a 15 percent reduction in dementia risk. This hazard ratio of 0.85 held steady after adjusting for factors such...