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How old is the youngest person to get Alzheimer's and what does this rare case reveal?

In 2023, a 19-year-old man in China became the youngest person with a documented case of probable Alzheimer's disease, experiencing symptoms since age 17. This finding, which challenged previous assumptions about the disease's age range, has provided new clues to researchers studying how old is the youngest person to get Alzheimer's and the underlying causes of its very early onset.