9 years old now in 2023 - what year born?

Today, 22 March 2023 if a person is 9 years old now, what year was he born? See below:

If 9 years old, year of birth is:
2013 or 2014*

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

If now 9 years and his year of birth 2013 if he was born after 22 March 2013 until 31 december 2013 inclusively, and his year of birth is 2014 if he was born from 1 January 2014 to 22 March 2014.

Other examples:

If now 11 years, year of birth 2011 or 2012
If now 14 years, year of birth 2008 or 2009
If now 29 years, year of birth 1993 or 1994
If now 33 years, year of birth 1989 or 1990

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