15 years old now in 2025 - what year born?

Today, 11 February 2025 if a person is 15 years old now, what year was he born? See below:

If 15 years old, year of birth is:
2009 or 2010*

*It depends on whether he was born before or after 1 January 2010.

If now 15 years and his year of birth 2009 if he was born after 11 February 2009 until 31 december 2009 inclusively, and his year of birth is 2010 if he was born from 1 January 2010 to 11 February 2010.

Other examples:

If now 6 years, year of birth 2018 or 2019
If now 16 years, year of birth 2008 or 2009
If now 22 years, year of birth 2002 or 2003
If now 32 years, year of birth 1992 or 1993

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