104 years old now in 2021 - what year born?


Today, 26 January 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 26 January 1916 until 31 december 1916 inclusively, and his year of birth is 1917 if he was born from 1 January 1917 to 26 January 1917.


Other examples:

If now 5 years, year of birth 2015 or 2016
If now 17 years, year of birth 2003 or 2004
If now 23 years, year of birth 1997 or 1998
If now 42 years, year of birth 1978 or 1979

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