23 years old now in 2025 - what year born?

Today, 16 January 2025 if a person is 23 years old now, what year was he born? See below:

If 23 years old, year of birth is:
2001 or 2002*

*It depends on whether he was born before or after 1 January 2002.

If now 23 years and his year of birth 2001 if he was born after 16 January 2001 until 31 december 2001 inclusively, and his year of birth is 2002 if he was born from 1 January 2002 to 16 January 2002.

Other examples:

If now 4 years, year of birth 2020 or 2021
If now 15 years, year of birth 2009 or 2010
If now 27 years, year of birth 1997 or 1998
If now 97 years, year of birth 1927 or 1928

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