Alzheimer's disease may be becoming an epidemic.
The number of U.S. cases has increased to 5 million from 4.5 million in the past 5 years, according to David Shenk, author of "The Forgetting. Alzheimer's: Portrait of an Epidemic."
With the oldest boomers approaching age 65, that number could mushroom to 15 million by 2011, Shenk warned during a teleconference sponsored by a foundation affiliated with MetLife Inc., New York.
"Alzheimer's affects not only the patient but also caregivers," Shenk said. "It can take people's lives over for a decade or more."