old age       
noun [ U ] uk/ˌəʊld ˈeɪdʒ/ us/ˌoʊld ˈeɪdʒ/
 老年,晚年
the period in a person's life when he or she is old
  She became very depressed in her old age. 她晚年变得很抑郁。 
 See also: age noun
 
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