11 years old now in 2024 - what year born?

Today, 15 October 2024 if a person is 11 years old now, what year was he born? See below:

If 11 years old, year of birth is:
2012 or 2013*

*It depends on whether he was born before or after 1 January 2013.

If now 11 years and his year of birth 2012 if he was born after 15 October 2012 until 31 december 2012 inclusively, and his year of birth is 2013 if he was born from 1 January 2013 to 15 October 2013.

Other examples:

If now 12 years, year of birth 2011 or 2012
If now 17 years, year of birth 2006 or 2007
If now 25 years, year of birth 1998 or 1999
If now 53 years, year of birth 1970 or 1971

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