The overall incidence of the amnestic disorders is difficult to estimate. Amnestic disorders related to head injuries may affect people in any age group. Alcohol-induced amnestic disorder is most common in people over the age of 40 with histories of prolonged heavy alcohol use. Amnestic disorders resulting from the abuse of drugs other than alcohol are most common in people between the ages of 20 and 40. Transient global amnesia usually appears in people over 50. Only 3% of people who experience transient global amnesia have symptoms that recur within a year.

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