According to the Department of Health and Human Services, the fastest growing segment of the population is over 85 years old. In the past 30 years, the number of Americans over 85 has tripled. And the number of people who are 100 has doubled in the past decade. This longevity comes with a price. At age 85, you have nearly a 50 per cent chance of developing Alzheimer's. Joanne Faryon tells us more about what the diagnosis means.