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study of the elderly, what is the study of the elderly, the study of elderly people, study science of the elderly aged, the study of aging and the elderly, the study of old age, the study of old people, the study of aging, what is the study of aging called, the study of the aging process, study of aging gerontology, study of old age is called, related study about age, research indicates that older adults, research on older adults has shown that