24 years old now in 2025 - what year born?

Today, 23 January 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 23 January 2000 until 31 december 2000 inclusively, and his year of birth is 2001 if he was born from 1 January 2001 to 23 January 2001.

Other examples:

If now 7 years, year of birth 2017 or 2018
If now 15 years, year of birth 2009 or 2010
If now 30 years, year of birth 1994 or 1995
If now 74 years, year of birth 1950 or 1951

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