111 years old now in 2021 - what year born?


Today, 21 January 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 21 January 1909 until 31 december 1909 inclusively, and his year of birth is 1910 if he was born from 1 January 1910 to 21 January 1910.


Other examples:

If now 5 years, year of birth 2015 or 2016
If now 12 years, year of birth 2008 or 2009
If now 27 years, year of birth 1993 or 1994
If now 90 years, year of birth 1930 or 1931

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