8 years old now in 2022 - what year born?

Today, 5 December 2022 if a person is 8 years old now, what year was he born? See below:

If 8 years old, year of birth is:
2013 or 2014*

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

If now 8 years and his year of birth 2013 if he was born after 5 December 2013 until 31 december 2013 inclusively, and his year of birth is 2014 if he was born from 1 January 2014 to 5 December 2014.

Other examples:

If now 10 years, year of birth 2011 or 2012
If now 14 years, year of birth 2007 or 2008
If now 23 years, year of birth 1998 or 1999
If now 84 years, year of birth 1937 or 1938

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