Epidemiology of Alzheimer’s Disease

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Abstract
The increasing and widespread interest in age-associated dementia originated because of the rapid aging of the world population. Those aged 60 years and over were approximately 376 million in 1980, are expected to reach 590 million by the year 2000, and 976 million by the year 2020. 1 The increasing number of elderly people implies a larger number of subjects at risk for age-associated neurologic disorders such as dementia, parkinsonism, stroke, and peripheral neuropathies. In the past, the rapid aging was limited to the so-called “developed countries”, which in 1980 accounted for almost 50% of the world population over age 60. At present, the number of elderly people living in developing countries is increasing rapidly and by the year 2020 will represent 70% of the world elderly population. 1

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