23 years old now in 2024 - what year born?

Today, 12 September 2024 if a person is 23 years old now, what year was he born? See below:

If 23 years old, year of birth is:
2000 or 2001*

*It depends on whether he was born before or after 1 January 2001.

If now 23 years and his year of birth 2000 if he was born after 12 September 2000 until 31 december 2000 inclusively, and his year of birth is 2001 if he was born from 1 January 2001 to 12 September 2001.

Other examples:

If now 4 years, year of birth 2019 or 2020
If now 14 years, year of birth 2009 or 2010
If now 24 years, year of birth 1999 or 2000
If now 82 years, year of birth 1941 or 1942

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