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  1. ^ Middle age . CollinsDictionary.com. Collins English Dictionary - Complete & Unabridged 11th Edition. Retrieved December 05, 2012. ???? ?????? 2017-07-12 ?? Wayback Machine
  2. ^ "Products - Data Briefs - Number 193 - March 2015" . ????? ?? ????? ?? 2018-06-29.
  3. ^ "Definition of MIDDLE AGE" . ????? ?? ????? ?? 2018-01-29.

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