25 years old now in 2024 - what year born?

Today, 10 October 2024 if a person is 25 years old now, what year was he born? See below:

If 25 years old, year of birth is:
1998 or 1999*

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

If now 25 years and his year of birth 1998 if he was born after 10 October 1998 until 31 december 1998 inclusively, and his year of birth is 1999 if he was born from 1 January 1999 to 10 October 1999.

Other examples:

If now 10 years, year of birth 2013 or 2014
If now 18 years, year of birth 2005 or 2006
If now 26 years, year of birth 1997 or 1998
If now 89 years, year of birth 1934 or 1935

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