113 years old now in 2025 - what year born?

Today, 19 December 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 19 December 1911 until 31 december 1911 inclusively, and his year of birth is 1912 if he was born from 1 January 1912 to 19 December 1912.

Other examples:

If now 10 years, year of birth 2014 or 2015
If now 16 years, year of birth 2008 or 2009
If now 18 years, year of birth 2006 or 2007
If now 61 years, year of birth 1963 or 1964

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