89 years old now in 2020 - what year born?


Today, 21 September 2020 if a person is 89 years old now, what year was he born? See below:


If 89 years old, year of birth is:
1930 or 1931*
*It depends on whether he was born before or after 1 January 1931.


If now 89 years and his year of birth 1930 if he was born after 21 September 1930 until 31 december 1930 inclusively, and his year of birth is 1931 if he was born from 1 January 1931 to 21 September 1931.


Other examples:

If now 5 years, year of birth 2014 or 2015
If now 13 years, year of birth 2006 or 2007
If now 26 years, year of birth 1993 or 1994
If now 37 years, year of birth 1982 or 1983

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