9 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 9 years old now, what year was he born? See below:

If 9 years old, year of birth is:
2016 or 2017*

*It depends on whether he was born before or after 1 January 2017.

If now 9 years and his year of birth 2016 if he was born after 28 October 2016 until 31 december 2016 inclusively, and his year of birth is 2017 if he was born from 1 January 2017 to 28 October 2017.

Other examples:

If now 8 years, year of birth 2017 or 2018
If now 15 years, year of birth 2010 or 2011
If now 18 years, year of birth 2007 or 2008
If now 75 years, year of birth 1950 or 1951

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