One way to help prevent dementia may be to keep working, according to a new study done by a French government research agency.

FOX News Radio's Lisa Brady reports:

The longer you work, the lower your risk of various types of dementia. That's the suggestion, from the largest study of its kind, based on the health records, of half a million people in France.

It finds for each additional year a person worked, the risk of getting dementia was reduced by more than 3%.

Seeming to boost the theory that staying mentally sharp helps prevent mental decline, along with physical activity and social interaction. And while they can all be fueled by work, one official with the Alzheimer's association notes, not everyone has to delay retirement, to stay active.

Lisa Brady, FOX News Radio.