15 years old now in 2023 - what year born?

Today, 26 March 2023 if a person is 15 years old now, what year was he born? See below:

If 15 years old, year of birth is:
2007 or 2008*

*It depends on whether he was born before or after 1 January 2008.

If now 15 years and his year of birth 2007 if he was born after 26 March 2007 until 31 december 2007 inclusively, and his year of birth is 2008 if he was born from 1 January 2008 to 26 March 2008.

Other examples:

If now 7 years, year of birth 2015 or 2016
If now 16 years, year of birth 2006 or 2007
If now 25 years, year of birth 1997 or 1998
If now 93 years, year of birth 1929 or 1930

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