20 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 20 years old now, what year was he born? See below:

If 20 years old, year of birth is:
2005 or 2006*

*It depends on whether he was born before or after 1 January 2006.

If now 20 years and his year of birth 2005 if he was born after 28 October 2005 until 31 december 2005 inclusively, and his year of birth is 2006 if he was born from 1 January 2006 to 28 October 2006.

Other examples:

If now 9 years, year of birth 2016 or 2017
If now 12 years, year of birth 2013 or 2014
If now 27 years, year of birth 1998 or 1999
If now 74 years, year of birth 1951 or 1952

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