2004 year born – age now in 2025?

How old am I in 2025 if I was born in 2004? Today's date is - 24 April 2025.

If year of birth - 2004, he is now:
20 years old or 21 years old*

*Depends on before or after 24 April 2004 year he was born.

If a person was born from January 1 2004 to 24 April 2004 inclusively, he is 21 year old now, otherwise, if after 24 April 2004 (until December 31 2004 inclusively), then he is still 20 years old now.

Other examples:

If 1917 year of birth - already 108 years or still 107 years.
If 1964 year of birth - already 61 years or still 60 years.
If 1977 year of birth - already 48 years or still 47 years.
If 2017 year of birth - already 8 years or still 7 years.

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