90 years old now in 2021 - what year born?


Today, 28 December 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 28 December 1930 until 31 december 1930 inclusively, and his year of birth is 1931 if he was born from 1 January 1931 to 28 December 1931.


Other examples:

If now 12 years, year of birth 2008 or 2009
If now 12 years, year of birth 2008 or 2009
If now 27 years, year of birth 1993 or 1994
If now 94 years, year of birth 1926 or 1927

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