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 11 years, year of birth 2014 or 2015
If now 14 years, year of birth 2011 or 2012
If now 24 years, year of birth 2001 or 2002
If now 36 years, year of birth 1989 or 1990

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