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How Quickly Do Stages of Alzheimer's Progress?

The speed of Alzheimer's progression varies widely among individuals, making the disease's timeline unpredictable. While the average person lives 4 to 8 years after diagnosis, some may live up to 20 years or more, depending on many personal factors. Understanding the average duration of each stage can help families prepare for the future, even if an individual's journey differs from the typical progression.