24 years old now in 2023 - what year born?

Today, 24 September 2023 if a person is 24 years old now, what year was he born? See below:

If 24 years old, year of birth is:
1998 or 1999*

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

If now 24 years and his year of birth 1998 if he was born after 24 September 1998 until 31 december 1998 inclusively, and his year of birth is 1999 if he was born from 1 January 1999 to 24 September 1999.

Other examples:

If now 3 years, year of birth 2019 or 2020
If now 16 years, year of birth 2006 or 2007
If now 25 years, year of birth 1997 or 1998
If now 57 years, year of birth 1965 or 1966

HTML code:

BB code: