81 years old now in 2021 - what year born?


Today, 28 July 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 28 July 1939 until 31 december 1939 inclusively, and his year of birth is 1940 if he was born from 1 January 1940 to 28 July 1940.


Other examples:

If now 6 years, year of birth 2014 or 2015
If now 16 years, year of birth 2004 or 2005
If now 29 years, year of birth 1991 or 1992
If now 35 years, year of birth 1985 or 1986

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