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What is the earliest someone can get Alzheimer's?

In 2023, a 19-year-old was diagnosed with probable Alzheimer's disease, marking the youngest case ever reported in a study. While most people associate this progressive disease with older age, an extremely rare, genetically-driven form of the condition known as familial Alzheimer's disease (FAD) can cause symptoms to emerge much earlier, answering the question: "What is the earliest someone can get Alzheimer's?".