111 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 111 years old now, what year was he born? See below:

If 111 years old, year of birth is:
1913 or 1914*

*It depends on whether he was born before or after 1 January 1914.

If now 111 years and his year of birth 1913 if he was born after 19 December 1913 until 31 december 1913 inclusively, and his year of birth is 1914 if he was born from 1 January 1914 to 19 December 1914.

Other examples:

If now 4 years, year of birth 2020 or 2021
If now 17 years, year of birth 2007 or 2008
If now 28 years, year of birth 1996 or 1997
If now 85 years, year of birth 1939 or 1940

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