Researchers at INSERM, the French government’s health research agency, studied 429,000 retirees in France who were formerly self-employed and discovered that their risk of having a diagnosis of dementia was reduced by 3.2 percent for each extra year they worked before retirement.
The link between later retirement and dementia was a bit stronger for men than women, she added.
“We were not surprised by the results, but we were surprised by the robustness of the findings,” Dufouil said. “Still, we need to be cautious as these results might not be generalizable. But this should encourage further research on the topic.”
More Reason to Stay Cognitively Active
Heather Snyder, Ph.D., director of scientific operations at the Alzheimer’s Association, says this new finding is another example of the importance of staying “cognitively active” as long as possible.
In the past, the idea of staying mentally engaged tended to mean things like doing the Sunday crossword puzzle, taking classes and reading. But the notion of working longer to fend off Alzheimer’s is fairly new.
Similar Study of Men, Work and Dementia
The French analysis echoes a 2009 study of 382 British male dementia patients by Cardiff University and the Institute of Psychiatry, King’s College London. Those researchers found that every extra year that men worked beyond age 65 postponed the onset of their dementia symptoms by nearly six weeks.
Dufouil said looking at the two studies together provides “further evidence to the hypothesis that intellectual stimulation throughout life might protect against dementia by either preventing it or delaying it.”
Alzheimer’s researchers sometimes call this the “use it or lose it” hypothesis.
A New Reason to Try to Work Longer
Not everyone, of course, can work as long as they’d like. Many people in their 60s and 70s get pushed out of their jobs to make room for younger, less expensive staffers; others have health issues that prevent them from remaining employed.
But if you’re physically and mentally able, I think this new study makes a powerful case for your health and your wealth: try to keep working – full-time or part-time – as long as you can. (Although all the participants were self-employed, you don't have to run a business to reap the cognitive benefits of a job.)
Lowering your risk of developing Alzheimer’s could, after all, also reduce the chance that you and your family will incur giant bills to pay for long-term care.