111 years old now in 2023 - what year born?

Today, 1 December 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 December 1911 until 31 december 1911 inclusively, and his year of birth is 1912 if he was born from 1 January 1912 to 1 December 1912.

Other examples:

If now 8 years, year of birth 2014 or 2015
If now 16 years, year of birth 2006 or 2007
If now 29 years, year of birth 1993 or 1994
If now 40 years, year of birth 1982 or 1983

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