8 years old now in 2023 - what year born?

Today, 1 December 2023 if a person is 8 years old now, what year was he born? See below:

If 8 years old, year of birth is:
2014 or 2015*

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

If now 8 years and his year of birth 2014 if he was born after 1 December 2014 until 31 december 2014 inclusively, and his year of birth is 2015 if he was born from 1 January 2015 to 1 December 2015.

Other examples:

If now 6 years, year of birth 2016 or 2017
If now 15 years, year of birth 2007 or 2008
If now 21 years, year of birth 2001 or 2002
If now 56 years, year of birth 1966 or 1967

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