Where did they get their data from?
These records were used for more than 429, 000 people who primarily worked in the areas of craftsmanship, shop keeping, baking, and woodworking. They also had an average age of 74. The results showed that approximately 3 percent of the individuals developed Alzheimer’s, and the risk decreased for every additional year of age that a person had when he or she retired. Dufouil said that people who retired at 65 years of age compared with people who retired at 60 had a 13 percent less chance of developing Alzheimer’s.