11 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 11 years old now, what year was he born? See below:

If 11 years old, year of birth is:
2013 or 2014*

*It depends on whether he was born before or after 1 January 2014.

If now 11 years and his year of birth 2013 if he was born after 19 December 2013 until 31 december 2013 inclusively, and his year of birth is 2014 if he was born from 1 January 2014 to 19 December 2014.

Other examples:

If now 5 years, year of birth 2019 or 2020
If now 16 years, year of birth 2008 or 2009
If now 21 years, year of birth 2003 or 2004
If now 99 years, year of birth 1925 or 1926

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