Depends . . .: There are many variables to consider when estimating life expectancy, even for dementia. On average, we often quote 10yrs average from Alzheimer's disease diagnosis to death but that differ dramatically depending upon other co-existing conditions/illnesses. 10yrs also assumes diagnosis before 70yo while only 4yrs if diagnosed after 90yo. Currently, average is 4.5yrs taking all above into account.
Answered 11/11/2014
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