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Aging --- Older people --- Aged --- Aging people --- Elderly people --- Old people --- Older adults --- Older persons --- Senior citizens --- Seniors (Older people) --- Age groups --- Persons --- Gerontocracy --- Gerontology --- Old age --- Age --- Ageing --- Senescence --- Developmental biology --- Longevity --- Age factors in disease --- Health aspects --- Moral and ethical aspects --- Social conditions. --- Economic conditions. --- Physiological effect