117 years old now in 2021 - what year born?


Today, 21 January 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 21 January 1903 until 31 december 1903 inclusively, and his year of birth is 1904 if he was born from 1 January 1904 to 21 January 1904.


Other examples:

If now 5 years, year of birth 2015 or 2016
If now 16 years, year of birth 2004 or 2005
If now 23 years, year of birth 1997 or 1998
If now 99 years, year of birth 1921 or 1922

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