115 years old now in 2021 - what year born?


Today, 15 September 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 15 September 1905 until 31 december 1905 inclusively, and his year of birth is 1906 if he was born from 1 January 1906 to 15 September 1906.


Other examples:

If now 9 years, year of birth 2011 or 2012
If now 17 years, year of birth 2003 or 2004
If now 22 years, year of birth 1998 or 1999
If now 86 years, year of birth 1934 or 1935

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