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What is the longest someone has lived with Lewy body dementia?

While the average life expectancy for Lewy body dementia (LBD) is 5 to 8 years after diagnosis, some individuals can live for up to 20 years or more. This significant variation in lifespan depends on multiple factors and is a key area of consideration for families asking **what is the longest someone has lived with Lewy body dementia?**.