2004 year born – age now in 2024?

How old am I in 2024 if I was born in 2004? Today's date is - 11 December 2024.

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

*Depends on before or after 11 December 2004 year he was born.

If a person was born from January 1 2004 to 11 December 2004 inclusively, he is 20 years old now, otherwise, if after 11 December 2004 (until December 31 2004 inclusively), then he is still 19 years old now.

Other examples:

If 1901 year of birth - already 123 years or still 122 years.
If 1961 year of birth - already 63 years or still 62 years.
If 1987 year of birth - already 37 years or still 36 years.
If 2005 year of birth - already 19 years or still 18 years.

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