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Each stage has its own set of symptoms. Mild Alzheimer's. The first stage usually lasts from 2 to 4 years. The symptoms include: Having less energy and drive to do things; Less interest in work and social activities and spending more time just sitting, watching TV, or sleeping
References. 1  Wolk DA, et al. Clinical features and diagnosis of Alzheimer disease. 2  Diagnosis of Alzheimer's disease and dementia. Alzheimer's Association. 3  About Alzheimer's disease: Diagnosis. National Institute on Aging. 4  Alzheimer's disease. National Institute of Health. 5  10 early signs and symptoms of Alzheimer's. Alzheimer's Association.