23 years old now in 2025 - what year born?

Today, 22 April 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 22 April 2001 until 31 december 2001 inclusively, and his year of birth is 2002 if he was born from 1 January 2002 to 22 April 2002.

Other examples:

If now 6 years, year of birth 2018 or 2019
If now 18 years, year of birth 2006 or 2007
If now 21 years, year of birth 2003 or 2004
If now 59 years, year of birth 1965 or 1966

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