What is Alzheimer’s Disease?

Alzheimer’s disease is the most prevalent type of dementia, accounting for over 60% of diagnoses globally, and is the most frequent form of early onset dementia, accounting for approximately one-third of all dementia patients under the age of 65.

A small proportion of individuals develop Familial Alzheimer’s disease (FAD), which is caused by a defective gene that runs in families. Symptoms of FAD usually appear before the age of 65, most often in the 40s or 50s.
People with Down syndrome and other learning difficulties are more likely to acquire dementia at a young age. Alzheimer’s disease is the most common cause of dementia among persons with Down syndrome.
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