89 years old now in 2021 - what year born?


Today, 14 April 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 14 April 1931 until 31 december 1931 inclusively, and his year of birth is 1932 if he was born from 1 January 1932 to 14 April 1932.


Other examples:

If now 6 years, year of birth 2014 or 2015
If now 15 years, year of birth 2005 or 2006
If now 22 years, year of birth 1998 or 1999
If now 61 years, year of birth 1959 or 1960

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