117 years old now in 2021 - what year born?


Today, 17 May 2021 if a person is 117 years old now, what year was he born? See below:


If 117 years old, year of birth is:
1903 or 1904*
*It depends on whether he was born before or after 1 January 1904.


If now 117 years and his year of birth 1903 if he was born after 17 May 1903 until 31 december 1903 inclusively, and his year of birth is 1904 if he was born from 1 January 1904 to 17 May 1904.


Other examples:

If now 7 years, year of birth 2013 or 2014
If now 18 years, year of birth 2002 or 2003
If now 23 years, year of birth 1997 or 1998
If now 60 years, year of birth 1960 or 1961

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