89 years old now in 2021 - what year born?


Today, 12 November 2021 if a person is 89 years old now, what year was he born? See below:


If 89 years old, year of birth is:
1931 or 1932*
*It depends on whether he was born before or after 1 January 1932.


If now 89 years and his year of birth 1931 if he was born after 12 November 1931 until 31 december 1931 inclusively, and his year of birth is 1932 if he was born from 1 January 1932 to 12 November 1932.


Other examples:

If now 10 years, year of birth 2010 or 2011
If now 13 years, year of birth 2007 or 2008
If now 30 years, year of birth 1990 or 1991
If now 98 years, year of birth 1922 or 1923

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