90 years old now in 2021 - what year born?


Today, 25 September 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 25 September 1930 until 31 december 1930 inclusively, and his year of birth is 1931 if he was born from 1 January 1931 to 25 September 1931.


Other examples:

If now 8 years, year of birth 2012 or 2013
If now 18 years, year of birth 2002 or 2003
If now 22 years, year of birth 1998 or 1999
If now 100 years, year of birth 1920 or 1921

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