27 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 27 years old now, what year was he born? See below:

If 27 years old, year of birth is:
1998 or 1999*

*It depends on whether he was born before or after 1 January 1999.

If now 27 years and his year of birth 1998 if he was born after 28 October 1998 until 31 december 1998 inclusively, and his year of birth is 1999 if he was born from 1 January 1999 to 28 October 1999.

Other examples:

If now 4 years, year of birth 2021 or 2022
If now 12 years, year of birth 2013 or 2014
If now 20 years, year of birth 2005 or 2006
If now 94 years, year of birth 1931 or 1932

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