104 years old now in 2021 - what year born?


Today, 13 October 2021 if a person is 104 years old now, what year was he born? See below:


If 104 years old, year of birth is:
1916 or 1917*
*It depends on whether he was born before or after 1 January 1917.


If now 104 years and his year of birth 1916 if he was born after 13 October 1916 until 31 december 1916 inclusively, and his year of birth is 1917 if he was born from 1 January 1917 to 13 October 1917.


Other examples:

If now 4 years, year of birth 2016 or 2017
If now 14 years, year of birth 2006 or 2007
If now 30 years, year of birth 1990 or 1991
If now 60 years, year of birth 1960 or 1961

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