16 years old now in 2023 - what year born?

Today, 24 September 2023 if a person is 16 years old now, what year was he born? See below:

If 16 years old, year of birth is:
2006 or 2007*

*It depends on whether he was born before or after 1 January 2007.

If now 16 years and his year of birth 2006 if he was born after 24 September 2006 until 31 december 2006 inclusively, and his year of birth is 2007 if he was born from 1 January 2007 to 24 September 2007.

Other examples:

If now 3 years, year of birth 2019 or 2020
If now 14 years, year of birth 2008 or 2009
If now 19 years, year of birth 2003 or 2004
If now 89 years, year of birth 1933 or 1934

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