27 years old now in 2025 - what year born?

Today, 18 January 2025 if a person is 27 years old now, what year was he born? See below:

If 27 years old, year of birth is:
1997 or 1998*

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

If now 27 years and his year of birth 1997 if he was born after 18 January 1997 until 31 december 1997 inclusively, and his year of birth is 1998 if he was born from 1 January 1998 to 18 January 1998.

Other examples:

If now 11 years, year of birth 2013 or 2014
If now 12 years, year of birth 2012 or 2013
If now 24 years, year of birth 2000 or 2001
If now 73 years, year of birth 1951 or 1952

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