8 years old now in 2024 - what year born?

Today, 12 September 2024 if a person is 8 years old now, what year was he born? See below:

If 8 years old, year of birth is:
2015 or 2016*

*It depends on whether he was born before or after 1 January 2016.

If now 8 years and his year of birth 2015 if he was born after 12 September 2015 until 31 december 2015 inclusively, and his year of birth is 2016 if he was born from 1 January 2016 to 12 September 2016.

Other examples:

If now 5 years, year of birth 2018 or 2019
If now 13 years, year of birth 2010 or 2011
If now 24 years, year of birth 1999 or 2000
If now 59 years, year of birth 1964 or 1965

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