115 years old now in 2020 - what year born?


Today, 20 September 2020 if a person is 115 years old now, what year was he born? See below:


If 115 years old, year of birth is:
1904 or 1905*
*It depends on whether he was born before or after 1 January 1905.


If now 115 years and his year of birth 1904 if he was born after 20 September 1904 until 31 december 1904 inclusively, and his year of birth is 1905 if he was born from 1 January 1905 to 20 September 1905.


Other examples:

If now 6 years, year of birth 2013 or 2014
If now 12 years, year of birth 2007 or 2008
If now 21 years, year of birth 1998 or 1999
If now 34 years, year of birth 1985 or 1986

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