104 years old now in 2021 - what year born?


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


Other examples:

If now 6 years, year of birth 2014 or 2015
If now 18 years, year of birth 2002 or 2003
If now 19 years, year of birth 2001 or 2002
If now 46 years, year of birth 1974 or 1975

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