117 years old now in 2020 - what year born?


Today, 20 September 2020 if a person is 117 years old now, what year was he born? See below:


If 117 years old, year of birth is:
1902 or 1903*
*It depends on whether he was born before or after 1 January 1903.


If now 117 years and his year of birth 1902 if he was born after 20 September 1902 until 31 december 1902 inclusively, and his year of birth is 1903 if he was born from 1 January 1903 to 20 September 1903.


Other examples:

If now 7 years, year of birth 2012 or 2013
If now 15 years, year of birth 2004 or 2005
If now 23 years, year of birth 1996 or 1997
If now 87 years, year of birth 1932 or 1933

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