104 years old now in 2020 - what year born?


Today, 27 October 2020 if a person is 104 years old now, what year was he born? See below:


If 104 years old, year of birth is:
1915 or 1916*
*It depends on whether he was born before or after 1 January 1916.


If now 104 years and his year of birth 1915 if he was born after 27 October 1915 until 31 december 1915 inclusively, and his year of birth is 1916 if he was born from 1 January 1916 to 27 October 1916.


Other examples:

If now 10 years, year of birth 2009 or 2010
If now 17 years, year of birth 2002 or 2003
If now 24 years, year of birth 1995 or 1996
If now 91 years, year of birth 1928 or 1929

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