81 years old now in 2022 - what year born?


Today, 8 December 2022 if a person is 81 years old now, what year was he born? See below:


If 81 years old, year of birth is:
1940 or 1941*
*It depends on whether he was born before or after 1 January 1941.


If now 81 years and his year of birth 1940 if he was born after 8 December 1940 until 31 december 1940 inclusively, and his year of birth is 1941 if he was born from 1 January 1941 to 8 December 1941.


Other examples:

If now 5 years, year of birth 2016 or 2017
If now 12 years, year of birth 2009 or 2010
If now 29 years, year of birth 1992 or 1993
If now 41 years, year of birth 1980 or 1981

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