111 years old now in 2021 - what year born?


Today, 26 October 2021 if a person is 111 years old now, what year was he born? See below:


If 111 years old, year of birth is:
1909 or 1910*
*It depends on whether he was born before or after 1 January 1910.


If now 111 years and his year of birth 1909 if he was born after 26 October 1909 until 31 december 1909 inclusively, and his year of birth is 1910 if he was born from 1 January 1910 to 26 October 1910.


Other examples:

If now 3 years, year of birth 2017 or 2018
If now 16 years, year of birth 2004 or 2005
If now 24 years, year of birth 1996 or 1997
If now 74 years, year of birth 1946 or 1947

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