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Middle age
Middle age is the period of age beyond young adulthood but before the onset of old age. Various attempts have been made to define this age and it can vary between cultures and historic or previous definitions of this stage of life.
==Definitions==
According to Collins Dictionary, this is "... usually considered to occur approximately between the ages of 40 and 60".〔(middle age ). CollinsDictionary.com. "Collins English Dictionary" - Complete & Unabridged 11th Edition. Retrieved December 05, 2012.〕 The current edition of the ''Oxford English Dictionary'' gives a similar definition but with a shorter span: "The period of life between young adulthood and old age, now usually regarded as between about forty-five and sixty." The US Census lists the category middle age around 45 to 64, while prominent psychologist Erik Erikson saw it ending a little later and defines middle adulthood as between 40 and 65. The ''Diagnostic and Statistical Manual of Mental Disorders'', the standard diagnostic manual of the American Psychiatric Association, used to define middle age as 40–60, but as of Edition IV (1994) revised the definition upwards to 45–65.
Sociologists and psychologists have made different divisions in human development. Those who are 20-40 years of age are considered to be in young adulthood. Those aged 40-60 are referred to as being in middle adulthood. Late adulthood includes those who are 65 years of age and older.
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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