2003 year born – age now in 2024?

How old am I in 2024 if I was born in 2003? Today's date is - 14 October 2024.

If year of birth - 2003, he is now:
20 years old or 21 years old*

*Depends on before or after 14 October 2003 year he was born.

If a person was born from January 1 2003 to 14 October 2003 inclusively, he is 21 year old now, otherwise, if after 14 October 2003 (until December 31 2003 inclusively), then he is still 20 years old now.

Other examples:

If 1900 year of birth - already 124 years or still 123 years.
If 1957 year of birth - already 67 years or still 66 years.
If 1979 year of birth - already 45 years or still 44 years.
If 2004 year of birth - already 20 years or still 19 years.

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