There are usually a "sporadic" by far the most common in the elderly, and a "familial", starting earlier.
Alzheimer's disease for over half of all cases of dementia in the elderly. The prevalence of the disease increases sharply with age.
In Belgium, the prevalence of dementia is estimated at 5 to 10% after 65 years and almost 20% over 80 years.
In France, the study "PAQUID" (1988-2001) showed that 17.8% of people over 75 suffer from Alzheimer's disease or a related syndrome. According to a departmental assessment of 2004, about 860 000 people are affected by Alzheimer's disease in France. A figure which could reach 1.3 million in 2020 and 2.1 million in 2040. The number of new cases is about 225 000 per year.
The prevalence of the disease increases if there is a history of head injury or disease. This increase may be explained by a lysis making neuronal disease symptoms earlier.
Alzheimer's disease for over half of all cases of dementia in the elderly. The prevalence of the disease increases sharply with age.
In Belgium, the prevalence of dementia is estimated at 5 to 10% after 65 years and almost 20% over 80 years.
In France, the study "PAQUID" (1988-2001) showed that 17.8% of people over 75 suffer from Alzheimer's disease or a related syndrome. According to a departmental assessment of 2004, about 860 000 people are affected by Alzheimer's disease in France. A figure which could reach 1.3 million in 2020 and 2.1 million in 2040. The number of new cases is about 225 000 per year.
The prevalence of the disease increases if there is a history of head injury or disease. This increase may be explained by a lysis making neuronal disease symptoms earlier.
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