18 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 18 years old now, what year was he born? See below:

If 18 years old, year of birth is:
2007 or 2008*

*It depends on whether he was born before or after 1 January 2008.

If now 18 years and his year of birth 2007 if he was born after 28 October 2007 until 31 december 2007 inclusively, and his year of birth is 2008 if he was born from 1 January 2008 to 28 October 2008.

Other examples:

If now 10 years, year of birth 2015 or 2016
If now 16 years, year of birth 2009 or 2010
If now 18 years, year of birth 2007 or 2008
If now 75 years, year of birth 1950 or 1951

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