Alzheimer's disease. Sliced sections from two brains. On the left is a normal brain of a 70-year-old. On the right is the brain of a 70-year-old with Alzheimer's disease. The right brain is atrophied with a loss of cortex and white matter. Alzheimer's disease is a dementing disorder marked by certain brain changes regardless of the age of onset. It is not a normal part of aging. It is a dementing disorder that leads to the loss of mental and physical functions. The chance of developing Alzheimer's increases with age.

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