14 years old now in 2024 - what year born?

Today, 15 September 2024 if a person is 14 years old now, what year was he born? See below:

If 14 years old, year of birth is:
2009 or 2010*

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

If now 14 years and his year of birth 2009 if he was born after 15 September 2009 until 31 december 2009 inclusively, and his year of birth is 2010 if he was born from 1 January 2010 to 15 September 2010.

Other examples:

If now 12 years, year of birth 2011 or 2012
If now 15 years, year of birth 2008 or 2009
If now 28 years, year of birth 1995 or 1996
If now 37 years, year of birth 1986 or 1987

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