24 years old now in 2025 - what year born?

Today, 19 December 2025 if a person is 24 years old now, what year was he born? See below:

If 24 years old, year of birth is:
2000 or 2001*

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

If now 24 years and his year of birth 2000 if he was born after 19 December 2000 until 31 december 2000 inclusively, and his year of birth is 2001 if he was born from 1 January 2001 to 19 December 2001.

Other examples:

If now 4 years, year of birth 2020 or 2021
If now 14 years, year of birth 2010 or 2011
If now 25 years, year of birth 1999 or 2000
If now 67 years, year of birth 1957 or 1958

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