103 years old now in 2021 - what year born?


Today, 14 September 2021 if a person is 103 years old now, what year was he born? See below:


If 103 years old, year of birth is:
1917 or 1918*
*It depends on whether he was born before or after 1 January 1918.


If now 103 years and his year of birth 1917 if he was born after 14 September 1917 until 31 december 1917 inclusively, and his year of birth is 1918 if he was born from 1 January 1918 to 14 September 1918.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 16 years, year of birth 2004 or 2005
If now 24 years, year of birth 1996 or 1997
If now 31 years, year of birth 1989 or 1990

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