2004 year born – age now in 2023?

How old am I in 2023 if I was born in 2004? Today's date is - 22 March 2023.

If year of birth - 2004, he is now:
18 years old or 19 years old*

*Depends on before or after 22 March 2004 year he was born.

If a person was born from January 1 2004 to 22 March 2004 inclusively, he is 19 years old now, otherwise, if after 22 March 2004 (until December 31 2004 inclusively), then he is still 18 years old now.

Other examples:

If 1950 year of birth - already 73 years or still 72 years.
If 1956 year of birth - already 67 years or still 66 years.
If 1993 year of birth - already 30 years or still 29 years.
If 2019 year of birth - already 4 years or still 3 years.

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