11 years old now in 2025 - what year born?

Today, 19 March 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 March 2013 until 31 december 2013 inclusively, and his year of birth is 2014 if he was born from 1 January 2014 to 19 March 2014.

Other examples:

If now 6 years, year of birth 2018 or 2019
If now 15 years, year of birth 2009 or 2010
If now 25 years, year of birth 1999 or 2000
If now 57 years, year of birth 1967 or 1968

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