91 years old now in 2022 - what year born?


Today, 5 December 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 5 December 1930 until 31 december 1930 inclusively, and his year of birth is 1931 if he was born from 1 January 1931 to 5 December 1931.


Other examples:

If now 10 years, year of birth 2011 or 2012
If now 15 years, year of birth 2006 or 2007
If now 19 years, year of birth 2002 or 2003
If now 84 years, year of birth 1937 or 1938

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