81 years old now in 2022 - what year born?


Today, 5 June 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 5 June 1940 until 31 december 1940 inclusively, and his year of birth is 1941 if he was born from 1 January 1941 to 5 June 1941.


Other examples:

If now 12 years, year of birth 2009 or 2010
If now 18 years, year of birth 2003 or 2004
If now 27 years, year of birth 1994 or 1995
If now 97 years, year of birth 1924 or 1925

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