83 years old now in 2021 - what year born?


Today, 25 July 2021 if a person is 83 years old now, what year was he born? See below:


If 83 years old, year of birth is:
1937 or 1938*
*It depends on whether he was born before or after 1 January 1938.


If now 83 years and his year of birth 1937 if he was born after 25 July 1937 until 31 december 1937 inclusively, and his year of birth is 1938 if he was born from 1 January 1938 to 25 July 1938.


Other examples:

If now 11 years, year of birth 2009 or 2010
If now 15 years, year of birth 2005 or 2006
If now 24 years, year of birth 1996 or 1997
If now 49 years, year of birth 1971 or 1972

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