117 years old now in 2021 - what year born?


Today, 17 September 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 September 1903 until 31 december 1903 inclusively, and his year of birth is 1904 if he was born from 1 January 1904 to 17 September 1904.


Other examples:

If now 7 years, year of birth 2013 or 2014
If now 13 years, year of birth 2007 or 2008
If now 28 years, year of birth 1992 or 1993
If now 94 years, year of birth 1926 or 1927

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