Nearly 3 percent had developed dementia but the risk of this was lower for each year of age at retirement. Someone who retired at 65 had about a 15 percent lower risk of developing dementia than someone retiring at 60, after other factors that affect those odds were taken into account. "For each additional year of work, the risk of getting dementia is reduced by 3.2 percent," said Carole Dufouil, a scientist at INSERM, the French government's health research agency.
It's by far the largest study to look at this issue, and researchers say the conclusion makes sense. Working tends to keep people physically active, socially connected and mentally challenged — all things known to help prevent mental decline, according to the CBS News report.
The CBS news report is here. For more on Alzheimer’s disease, see Psychiatric News here. The "Clinical Manual of Alzheimer’s and other Dementias" is available from American Psychiatric Publishing here.