The most common form of dementia is Alzheimer's disease. Many people will refer to dementia rather than Alzheimer's disease, but really Alzheimer's disease is just a type of dementia. Not all dementias are Alzheimer's disease. The second most common form of dementia is vascular dementia, which is due to either multiple acute strokes or accumulation over time of vascular disease in the brain with small stroke-like changes that we can see on imaging. The distinguishing factor, usually, between Alzheimer's disease and vascular dementia is that Alzheimer's disease is generally a continuously progressive disease. And with vascular dementia, there can often be a stepwise sort of progression. However, there is no distinction with the word dementia and Alzheimer's, only that not all dementias are Alzheimer's disease. The typical age of onset of dementia is over 65. Unfortunately, the incidence of Alzheimer's increases with age. There's a low risk in your early sixties, but by age 80 or 90, the risks can be as high as 30 to 50% of people developing dementia.
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