9 years old now in 2024 - what year born?

Today, 10 October 2024 if a person is 9 years old now, what year was he born? See below:

If 9 years old, year of birth is:
2014 or 2015*

*It depends on whether he was born before or after 1 January 2015.

If now 9 years and his year of birth 2014 if he was born after 10 October 2014 until 31 december 2014 inclusively, and his year of birth is 2015 if he was born from 1 January 2015 to 10 October 2015.

Other examples:

If now 8 years, year of birth 2015 or 2016
If now 12 years, year of birth 2011 or 2012
If now 26 years, year of birth 1997 or 1998
If now 72 years, year of birth 1951 or 1952

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