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How long do people usually live with early onset Alzheimer's?

While the average life expectancy after a diagnosis of Alzheimer's disease is 4 to 8 years, some people with early-onset Alzheimer's live as long as 20 years or more. The course of this disease is highly individual, with factors like genetics, age at diagnosis, and overall health significantly impacting the prognosis. It's crucial for individuals and families to understand these variables when considering how long do people usually live with early onset Alzheimer's.