81 years old now in 2020 - what year born?


Today, 22 September 2020 if a person is 81 years old now, what year was he born? See below:


If 81 years old, year of birth is:
1938 or 1939*
*It depends on whether he was born before or after 1 January 1939.


If now 81 years and his year of birth 1938 if he was born after 22 September 1938 until 31 december 1938 inclusively, and his year of birth is 1939 if he was born from 1 January 1939 to 22 September 1939.


Other examples:

If now 6 years, year of birth 2013 or 2014
If now 14 years, year of birth 2005 or 2006
If now 29 years, year of birth 1990 or 1991
If now 37 years, year of birth 1982 or 1983

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