91 years old now in 2022 - what year born?


Today, 6 June 2022 if a person is 91 years old now, what year was he born? See below:


If 91 years old, year of birth is:
1930 or 1931*
*It depends on whether he was born before or after 1 January 1931.


If now 91 years and his year of birth 1930 if he was born after 6 June 1930 until 31 december 1930 inclusively, and his year of birth is 1931 if he was born from 1 January 1931 to 6 June 1931.


Other examples:

If now 3 years, year of birth 2018 or 2019
If now 13 years, year of birth 2008 or 2009
If now 25 years, year of birth 1996 or 1997
If now 97 years, year of birth 1924 or 1925

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