89 years old now in 2021 - what year born?


Today, 29 July 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 29 July 1931 until 31 december 1931 inclusively, and his year of birth is 1932 if he was born from 1 January 1932 to 29 July 1932.


Other examples:

If now 5 years, year of birth 2015 or 2016
If now 12 years, year of birth 2008 or 2009
If now 27 years, year of birth 1993 or 1994
If now 66 years, year of birth 1954 or 1955

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