113 years old now in 2025 - what year born?

Today, 18 January 2025 if a person is 113 years old now, what year was he born? See below:

If 113 years old, year of birth is:
1911 or 1912*

*It depends on whether he was born before or after 1 January 1912.

If now 113 years and his year of birth 1911 if he was born after 18 January 1911 until 31 december 1911 inclusively, and his year of birth is 1912 if he was born from 1 January 1912 to 18 January 1912.

Other examples:

If now 6 years, year of birth 2018 or 2019
If now 17 years, year of birth 2007 or 2008
If now 22 years, year of birth 2002 or 2003
If now 38 years, year of birth 1986 or 1987

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