103 years old now in 2020 - what year born?


Today, 19 September 2020 if a person is 103 years old now, what year was he born? See below:


If 103 years old, year of birth is:
1916 or 1917*
*It depends on whether he was born before or after 1 January 1917.


If now 103 years and his year of birth 1916 if he was born after 19 September 1916 until 31 december 1916 inclusively, and his year of birth is 1917 if he was born from 1 January 1917 to 19 September 1917.


Other examples:

If now 8 years, year of birth 2011 or 2012
If now 18 years, year of birth 2001 or 2002
If now 29 years, year of birth 1990 or 1991
If now 63 years, year of birth 1956 or 1957

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