83 years old now in 2021 - what year born?


Today, 12 October 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 12 October 1937 until 31 december 1937 inclusively, and his year of birth is 1938 if he was born from 1 January 1938 to 12 October 1938.


Other examples:

If now 6 years, year of birth 2014 or 2015
If now 17 years, year of birth 2003 or 2004
If now 19 years, year of birth 2001 or 2002
If now 59 years, year of birth 1961 or 1962

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