Which percentage of the population that is 85 years of age and older has some stage of Alzheimer disease (AD)?

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AD is the most common degenerative disease of the brain.Approximately 5.3 million Americans have AD (Alzheimer 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.

Which Percentage of the Population That Is 85 Years of Age