90 years old now in 2022 - what year born?


Today, 3 December 2022 if a person is 90 years old now, what year was he born? See below:


If 90 years old, year of birth is:
1931 or 1932*
*It depends on whether he was born before or after 1 January 1932.


If now 90 years and his year of birth 1931 if he was born after 3 December 1931 until 31 december 1931 inclusively, and his year of birth is 1932 if he was born from 1 January 1932 to 3 December 1932.


Other examples:

If now 7 years, year of birth 2014 or 2015
If now 15 years, year of birth 2006 or 2007
If now 27 years, year of birth 1994 or 1995
If now 49 years, year of birth 1972 or 1973

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