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Young-onset Alzheimer's: When symptoms begin before age 65

Family history of disease

For most people with young-onset Alzheimer's, the cause is not related to any single gene. Researchers don't fully know why some people get the disease at a younger age than others do.

Risk factors for young-onset Alzheimer's disease include a family history of the condition. Having a parent or grandparent with young-onset Alzheimer's increases the risk of developing the disease. But a family history of the disease doesn't mean you will necessarily develop the disease.