90 years old now in 2021 - what year born?


Today, 21 January 2021 if a person is 90 years old now, what year was he born? See below:


If 90 years old, year of birth is:
1930 or 1931*
*It depends on whether he was born before or after 1 January 1931.


If now 90 years and his year of birth 1930 if he was born after 21 January 1930 until 31 december 1930 inclusively, and his year of birth is 1931 if he was born from 1 January 1931 to 21 January 1931.


Other examples:

If now 4 years, year of birth 2016 or 2017
If now 12 years, year of birth 2008 or 2009
If now 18 years, year of birth 2002 or 2003
If now 74 years, year of birth 1946 or 1947

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