113 years old now in 2025 - what year born?

Today, 22 April 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 22 April 1911 until 31 december 1911 inclusively, and his year of birth is 1912 if he was born from 1 January 1912 to 22 April 1912.

Other examples:

If now 9 years, year of birth 2015 or 2016
If now 14 years, year of birth 2010 or 2011
If now 18 years, year of birth 2006 or 2007
If now 80 years, year of birth 1944 or 1945

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