111 years old now in 2022 - what year born?


Today, 28 September 2022 if a person is 111 years old now, what year was he born? See below:


If 111 years old, year of birth is:
1910 or 1911*
*It depends on whether he was born before or after 1 January 1911.


If now 111 years and his year of birth 1910 if he was born after 28 September 1910 until 31 december 1910 inclusively, and his year of birth is 1911 if he was born from 1 January 1911 to 28 September 1911.


Other examples:

If now 8 years, year of birth 2013 or 2014
If now 12 years, year of birth 2009 or 2010
If now 20 years, year of birth 2001 or 2002
If now 100 years, year of birth 1921 or 1922

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