Why senile dementia was misclassified as "Alzheimer's disease," and how it confused the field.In 1907, Aloysius "Alois" Alzheimer presented a rare case of dementia in a 51-year-old woman. This "presenile dementia" (younger than 60) was thought distinct enough from "senile dementia" (older than 65) to warrant a new name, thus it became known as, "Alzheimer's disease"

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