91 years old now in 2022 - what year born?


Today, 17 January 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 17 January 1930 until 31 december 1930 inclusively, and his year of birth is 1931 if he was born from 1 January 1931 to 17 January 1931.


Other examples:

If now 6 years, year of birth 2015 or 2016
If now 17 years, year of birth 2004 or 2005
If now 20 years, year of birth 2001 or 2002
If now 38 years, year of birth 1983 or 1984

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