17 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 17 years old now, what year was he born? See below:

If 17 years old, year of birth is:
2008 or 2009*

*It depends on whether he was born before or after 1 January 2009.

If now 17 years and his year of birth 2008 if he was born after 28 October 2008 until 31 december 2008 inclusively, and his year of birth is 2009 if he was born from 1 January 2009 to 28 October 2009.

Other examples:

If now 4 years, year of birth 2021 or 2022
If now 12 years, year of birth 2013 or 2014
If now 20 years, year of birth 2005 or 2006
If now 65 years, year of birth 1960 or 1961

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