The percentage of the population that is 85 years of age and older who have some stage of Alzheimer's disease is _____%.

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Alzheimer's disease (AD)is the most common degenerative disease of the brain.Approximately 5.3 million Americans have AD (Alzheimer's Association,2010),and there is no known cause or cure.AD typically affects people over 65 years of age,but can also strike younger people.The 85-year-old-and-over age group is currently the fastest-growing age group in the United States.It is estimated that 50% of this age group have AD.

The Percentage of the Population That Is 85 Years of Age