103 years old now in 2021 - what year born?


Today, 17 May 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 17 May 1917 until 31 december 1917 inclusively, and his year of birth is 1918 if he was born from 1 January 1918 to 17 May 1918.


Other examples:

If now 10 years, year of birth 2010 or 2011
If now 14 years, year of birth 2006 or 2007
If now 26 years, year of birth 1994 or 1995
If now 99 years, year of birth 1921 or 1922

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