Alzheimer's is the most common cause of dementia among older adults. Dementia is the loss of cognitive functioning-thinking, remembering, and reasoning-and behavioral abilities to such an extent that it interferes with a person's daily life and activities. Dementia ranges in severity from the mildest stage, when it is just beginning to affect a person's functioning, to the most severe stage, when the person must depend completely on others for basic activities of daily living.
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