90 years old now in 2020 - what year born?


Today, 24 October 2020 if a person is 90 years old now, what year was he born? See below:


If 90 years old, year of birth is:
1929 or 1930*
*It depends on whether he was born before or after 1 January 1930.


If now 90 years and his year of birth 1929 if he was born after 24 October 1929 until 31 december 1929 inclusively, and his year of birth is 1930 if he was born from 1 January 1930 to 24 October 1930.


Other examples:

If now 11 years, year of birth 2008 or 2009
If now 14 years, year of birth 2005 or 2006
If now 26 years, year of birth 1993 or 1994
If now 69 years, year of birth 1950 or 1951

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