26 years old now in 2025 - what year born?

Today, 16 January 2025 if a person is 26 years old now, what year was he born? See below:

If 26 years old, year of birth is:
1998 or 1999*

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

If now 26 years and his year of birth 1998 if he was born after 16 January 1998 until 31 december 1998 inclusively, and his year of birth is 1999 if he was born from 1 January 1999 to 16 January 1999.

Other examples:

If now 9 years, year of birth 2015 or 2016
If now 13 years, year of birth 2011 or 2012
If now 23 years, year of birth 2001 or 2002
If now 43 years, year of birth 1981 or 1982

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