2004 year born – age now in 2024?

How old am I in 2024 if I was born in 2004? Today's date is - 15 September 2024.

If year of birth - 2004, he is now:
19 years old or 20 years old*

*Depends on before or after 15 September 2004 year he was born.

If a person was born from January 1 2004 to 15 September 2004 inclusively, he is 20 years old now, otherwise, if after 15 September 2004 (until December 31 2004 inclusively), then he is still 19 years old now.

Other examples:

If 1942 year of birth - already 82 years or still 81 years.
If 1971 year of birth - already 53 years or still 52 years.
If 1990 year of birth - already 34 years or still 33 years.
If 2021 year of birth - already 3 years or still 2 years.

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