8 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 8 years old now, what year was he born? See below:

If 8 years old, year of birth is:
2017 or 2018*

*It depends on whether he was born before or after 1 January 2018.

If now 8 years and his year of birth 2017 if he was born after 28 October 2017 until 31 december 2017 inclusively, and his year of birth is 2018 if he was born from 1 January 2018 to 28 October 2018.

Other examples:

If now 10 years, year of birth 2015 or 2016
If now 16 years, year of birth 2009 or 2010
If now 20 years, year of birth 2005 or 2006
If now 36 years, year of birth 1989 or 1990

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