17 years old now in 2023 - what year born?

Today, 26 September 2023 if a person is 17 years old now, what year was he born? See below:

If 17 years old, year of birth is:
2005 or 2006*

*It depends on whether he was born before or after 1 January 2006.

If now 17 years and his year of birth 2005 if he was born after 26 September 2005 until 31 december 2005 inclusively, and his year of birth is 2006 if he was born from 1 January 2006 to 26 September 2006.

Other examples:

If now 5 years, year of birth 2017 or 2018
If now 15 years, year of birth 2007 or 2008
If now 29 years, year of birth 1993 or 1994
If now 46 years, year of birth 1976 or 1977

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