111 years old now in 2023 - what year born?


Today, 1 February 2023 if a person is 111 years old now, what year was he born? See below:


If 111 years old, year of birth is:
1911 or 1912*
*It depends on whether he was born before or after 1 January 1912.


If now 111 years and his year of birth 1911 if he was born after 1 February 1911 until 31 december 1911 inclusively, and his year of birth is 1912 if he was born from 1 January 1912 to 1 February 1912.


Other examples:

If now 4 years, year of birth 2018 or 2019
If now 18 years, year of birth 2004 or 2005
If now 18 years, year of birth 2004 or 2005
If now 78 years, year of birth 1944 or 1945

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