81 years old now in 2023 - what year born?


Today, 10 June 2023 if a person is 81 years old now, what year was he born? See below:


If 81 years old, year of birth is:
1941 or 1942*
*It depends on whether he was born before or after 1 January 1942.


If now 81 years and his year of birth 1941 if he was born after 10 June 1941 until 31 december 1941 inclusively, and his year of birth is 1942 if he was born from 1 January 1942 to 10 June 1942.


Other examples:

If now 3 years, year of birth 2019 or 2020
If now 14 years, year of birth 2008 or 2009
If now 30 years, year of birth 1992 or 1993
If now 91 years, year of birth 1931 or 1932

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