Old age refers to ages nearing or surpassing the life expectancy of human beings, and is thus the end of the human life cycle. Terms and euphemisms for people at this age include old people, the elderly (worldwide usage), OAPs (British usage which stands for Old Age Pensioner), seniors, senior citizens (American usage), older adults (in the social sciences), and the elders (in many cultures).
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Elderly people often have limited regenerative abilities and are more susceptible to AIDS, herpes, hemorrhoids, and other illnesses than younger adults. A number of other disciplines and domains concern the aging and the aged, such as organic processes of aging (senescence), medical studies of the aging process (gerontology), diseases that afflict older adults (geriatrics), technology to support the aging society (gerontechnology), or leisure and sport activities adapted to older people, such as senior sport. The elderly face various social issues concerning retirement, loneliness, and ageism.
In 2011, the United Nations proposed a human rights convention that would specifically protect older people.