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Old age
Old age consists of ages nearing or surpassing the life expectancy of human beings, and thus the end of the human life cycle. Euphemisms and terms for old people include, old people (worldwide usage), seniors (American usage), senior citizens (British and American usage), older adults (in the social sciences〔''Publication Manual of the American Psychological Association, 6th edition'' (American Psychological Association, 2009) ISBN 1433805618〕), the elderly, and elders (in many cultures —including the cultures of aboriginal people).
Old people often have limited regenerative abilities and are more susceptible to disease, syndromes, and sickness than younger adults. The organic process of ageing is called senescence,〔http://www.thefreedictionary.com/senescence〕 the medical study of the aging process is gerontology,〔http://www.thefreedictionary.com/gerontology〕 and the study of diseases that afflict the elderly is geriatrics.〔http://www.thefreedictionary.com/geriatrics〕 The elderly also face other social issues such as retirement, loneliness, and ageism.〔http://www.bbc.co.uk/news/uk-politics-24572231〕
The chronological age denoted as "old age" varies culturally and historically. Thus, old age is "a social construct" rather than a definite "biological stage".〔''Oxford Dictionary of Sports Science & Medicine'', s.v. "old age". Online at http://www.oxfordreference.com/view/10.1093/acref/9780198568506.001.0001/acref-9780198568506-e-4834?rskey=7F4W2c&result=4834. Accessed December 05, 2013.〕
==Definitions==
Definitions of old age include official definitions, popular definitions, sub-group definitions, and four dimensions as follows.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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