24 years old now in 2024 - what year born?

Today, 15 October 2024 if a person is 24 years old now, what year was he born? See below:

If 24 years old, year of birth is:
1999 or 2000*

*It depends on whether he was born before or after 1 January 2000.

If now 24 years and his year of birth 1999 if he was born after 15 October 1999 until 31 december 1999 inclusively, and his year of birth is 2000 if he was born from 1 January 2000 to 15 October 2000.

Other examples:

If now 6 years, year of birth 2017 or 2018
If now 16 years, year of birth 2007 or 2008
If now 24 years, year of birth 1999 or 2000
If now 31 years, year of birth 1992 or 1993

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