11 years old now in 2023 - what year born?

Today, 1 December 2023 if a person is 11 years old now, what year was he born? See below:

If 11 years old, year of birth is:
2011 or 2012*

*It depends on whether he was born before or after 1 January 2012.

If now 11 years and his year of birth 2011 if he was born after 1 December 2011 until 31 december 2011 inclusively, and his year of birth is 2012 if he was born from 1 January 2012 to 1 December 2012.

Other examples:

If now 9 years, year of birth 2013 or 2014
If now 15 years, year of birth 2007 or 2008
If now 28 years, year of birth 1994 or 1995
If now 93 years, year of birth 1929 or 1930

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