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 5 years, year of birth 2020 or 2021
If now 13 years, year of birth 2012 or 2013
If now 23 years, year of birth 2002 or 2003
If now 98 years, year of birth 1927 or 1928

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