17 years old now in 2024 - what year born?

Today, 15 October 2024 if a person is 17 years old now, what year was he born? See below:

If 17 years old, year of birth is:
2006 or 2007*

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

If now 17 years and his year of birth 2006 if he was born after 15 October 2006 until 31 december 2006 inclusively, and his year of birth is 2007 if he was born from 1 January 2007 to 15 October 2007.

Other examples:

If now 4 years, year of birth 2019 or 2020
If now 12 years, year of birth 2011 or 2012
If now 18 years, year of birth 2005 or 2006
If now 47 years, year of birth 1976 or 1977

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