ABSTRACT
The brief descriptive epidemiology of dementia is included within, at most several paragraphs in
many neurology and geriatric medicine texts. To paraphrase what texts often seem to say we offer
the following; the first sub-paragraph is often all that is included under epidemiology:
. . . Dementia has many causes, Alzheimer’s disease (AD) and vascular dementia (VaD)
predominate. The occurrence of dementia is more common with increasing age; both the
incidence (new cases per time) and the prevalence (proportion of persons living with
dementia) increase almost exponentially with age after about age 60. There are more
women living with dementia than there are men, yet for a given age group the occurrence
of new cases per unit time may be similar in both genders. Estimates indicate 5% to 10% of
persons over age 64 are living with dementia and 1% to 3% of those over age 64 acquire
the syndrome annually in Europe, North America, and parts of Asia.