117 years old now in 2022 - what year born?


Today, 8 December 2022 if a person is 117 years old now, what year was he born? See below:


If 117 years old, year of birth is:
1904 or 1905*
*It depends on whether he was born before or after 1 January 1905.


If now 117 years and his year of birth 1904 if he was born after 8 December 1904 until 31 december 1904 inclusively, and his year of birth is 1905 if he was born from 1 January 1905 to 8 December 1905.


Other examples:

If now 10 years, year of birth 2011 or 2012
If now 15 years, year of birth 2006 or 2007
If now 26 years, year of birth 1995 or 1996
If now 50 years, year of birth 1971 or 1972

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