91 years old now in 2021 - what year born?


Today, 22 January 2021 if a person is 91 years old now, what year was he born? See below:


If 91 years old, year of birth is:
1929 or 1930*
*It depends on whether he was born before or after 1 January 1930.


If now 91 years and his year of birth 1929 if he was born after 22 January 1929 until 31 december 1929 inclusively, and his year of birth is 1930 if he was born from 1 January 1930 to 22 January 1930.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 18 years, year of birth 2002 or 2003
If now 30 years, year of birth 1990 or 1991
If now 77 years, year of birth 1943 or 1944

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