28 years old now in 2026 - what year born?

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

If 28 years old, year of birth is:
1997 or 1998*

*It depends on whether he was born before or after 1 January 1998.

If now 28 years and his year of birth 1997 if he was born after 28 October 1997 until 31 december 1997 inclusively, and his year of birth is 1998 if he was born from 1 January 1998 to 28 October 1998.

Other examples:

If now 11 years, year of birth 2014 or 2015
If now 13 years, year of birth 2012 or 2013
If now 18 years, year of birth 2007 or 2008
If now 100 years, year of birth 1925 or 1926

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