19 years old now in 2023 - what year born?

Today, 22 March 2023 if a person is 19 years old now, what year was he born? See below:

If 19 years old, year of birth is:
2003 or 2004*

*It depends on whether he was born before or after 1 January 2004.

If now 19 years and his year of birth 2003 if he was born after 22 March 2003 until 31 december 2003 inclusively, and his year of birth is 2004 if he was born from 1 January 2004 to 22 March 2004.

Other examples:

If now 9 years, year of birth 2013 or 2014
If now 15 years, year of birth 2007 or 2008
If now 29 years, year of birth 1993 or 1994
If now 56 years, year of birth 1966 or 1967

HTML code:

BB code: