115 years old now in 2021 - what year born?


Today, 28 December 2021 if a person is 115 years old now, what year was he born? See below:


If 115 years old, year of birth is:
1905 or 1906*
*It depends on whether he was born before or after 1 January 1906.


If now 115 years and his year of birth 1905 if he was born after 28 December 1905 until 31 december 1905 inclusively, and his year of birth is 1906 if he was born from 1 January 1906 to 28 December 1906.


Other examples:

If now 8 years, year of birth 2012 or 2013
If now 13 years, year of birth 2007 or 2008
If now 27 years, year of birth 1993 or 1994
If now 61 years, year of birth 1959 or 1960

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