89 years old now in 2020 - what year born?


Today, 4 December 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 4 December 1930 until 31 december 1930 inclusively, and his year of birth is 1931 if he was born from 1 January 1931 to 4 December 1931.


Other examples:

If now 12 years, year of birth 2007 or 2008
If now 14 years, year of birth 2005 or 2006
If now 26 years, year of birth 1993 or 1994
If now 38 years, year of birth 1981 or 1982

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