14 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 14 years old now, what year was he born? See below:

If 14 years old, year of birth is:
2010 or 2011*

*It depends on whether he was born before or after 1 January 2011.

If now 14 years and his year of birth 2010 if he was born after 19 December 2010 until 31 december 2010 inclusively, and his year of birth is 2011 if he was born from 1 January 2011 to 19 December 2011.

Other examples:

If now 12 years, year of birth 2012 or 2013
If now 18 years, year of birth 2006 or 2007
If now 21 years, year of birth 2003 or 2004
If now 95 years, year of birth 1929 or 1930

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