81 years old now in 2021 - what year born?


Today, 7 May 2021 if a person is 81 years old now, what year was he born? See below:


If 81 years old, year of birth is:
1939 or 1940*
*It depends on whether he was born before or after 1 January 1940.


If now 81 years and his year of birth 1939 if he was born after 7 May 1939 until 31 december 1939 inclusively, and his year of birth is 1940 if he was born from 1 January 1940 to 7 May 1940.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 14 years, year of birth 2006 or 2007
If now 23 years, year of birth 1997 or 1998
If now 66 years, year of birth 1954 or 1955

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