Many people who have trouble remembering things jump to the conclusion that they have Alzheimer's, a disease which slowly saps the memory, eventually leading to severe confusion and disorientation. But epidemiological studies have shown that people between the ages of 65 and 75 have only a 2 percent chance of developing the disease. That means 98 out of 100 people who at age of 65 find themselves forgetting names and shopping lists, in fact, have...