2004 year born – age now in 2023?

How old am I in 2023 if I was born in 2004? Today's date is - 7 December 2023.

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

*Depends on before or after 7 December 2004 year he was born.

If a person was born from January 1 2004 to 7 December 2004 inclusively, he is 19 years old now, otherwise, if after 7 December 2004 (until December 31 2004 inclusively), then he is still 18 years old now.

Other examples:

If 1901 year of birth - already 122 years or still 121 years.
If 1972 year of birth - already 51 years or still 50 years.
If 1994 year of birth - already 29 years or still 28 years.
If 2015 year of birth - already 8 years or still 7 years.

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