81 years old now in 2020 - what year born?


Today, 30 November 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 30 November 1938 until 31 december 1938 inclusively, and his year of birth is 1939 if he was born from 1 January 1939 to 30 November 1939.


Other examples:

If now 12 years, year of birth 2007 or 2008
If now 16 years, year of birth 2003 or 2004
If now 20 years, year of birth 1999 or 2000
If now 89 years, year of birth 1930 or 1931

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