Alzheimer 's disease is relentlessly progressive and leads to death in 5 to 15 years . Examinations of the brains of persons who have died of Alzheimer 's disease show characteristic twisted fibers , called neurofibrillary tangles , in certain areas of the brain , and cores of abnormal protein , called neuritic plaques , interspersed among nerve cells . No cure is known for Alzheimer 's disease . A form of this disease strikes younger persons , in whom it is known as presenile dementia . ORIGIN OF MENTAL...











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