81 years old now in 2021 - what year born?


Today, 12 October 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 12 October 1939 until 31 december 1939 inclusively, and his year of birth is 1940 if he was born from 1 January 1940 to 12 October 1940.


Other examples:

If now 5 years, year of birth 2015 or 2016
If now 18 years, year of birth 2002 or 2003
If now 25 years, year of birth 1995 or 1996
If now 49 years, year of birth 1971 or 1972

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