117 years old now in 2023 - what year born?


Today, 24 September 2023 if a person is 117 years old now, what year was he born? See below:


If 117 years old, year of birth is:
1905 or 1906*
*It depends on whether he was born before or after 1 January 1906.


If now 117 years and his year of birth 1905 if he was born after 24 September 1905 until 31 december 1905 inclusively, and his year of birth is 1906 if he was born from 1 January 1906 to 24 September 1906.


Other examples:

If now 8 years, year of birth 2014 or 2015
If now 15 years, year of birth 2007 or 2008
If now 26 years, year of birth 1996 or 1997
If now 93 years, year of birth 1929 or 1930

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