91 years old now in 2023 - what year born?


Today, 26 March 2023 if a person is 91 years old now, what year was he born? See below:


If 91 years old, year of birth is:
1931 or 1932*
*It depends on whether he was born before or after 1 January 1932.


If now 91 years and his year of birth 1931 if he was born after 26 March 1931 until 31 december 1931 inclusively, and his year of birth is 1932 if he was born from 1 January 1932 to 26 March 1932.


Other examples:

If now 8 years, year of birth 2014 or 2015
If now 13 years, year of birth 2009 or 2010
If now 20 years, year of birth 2002 or 2003
If now 34 years, year of birth 1988 or 1989

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