113 years old now in 2024 - what year born?

Today, 15 October 2024 if a person is 113 years old now, what year was he born? See below:

If 113 years old, year of birth is:
1910 or 1911*

*It depends on whether he was born before or after 1 January 1911.

If now 113 years and his year of birth 1910 if he was born after 15 October 1910 until 31 december 1910 inclusively, and his year of birth is 1911 if he was born from 1 January 1911 to 15 October 1911.

Other examples:

If now 10 years, year of birth 2013 or 2014
If now 12 years, year of birth 2011 or 2012
If now 21 years, year of birth 2002 or 2003
If now 72 years, year of birth 1951 or 1952

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