2003 year born – age now in 2023?

How old am I in 2023 if I was born in 2003? Today's date is - 26 September 2023.

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

*Depends on before or after 26 September 2003 year he was born.

If a person was born from January 1 2003 to 26 September 2003 inclusively, he is 20 years old now, otherwise, if after 26 September 2003 (until December 31 2003 inclusively), then he is still 19 years old now.

Other examples:

If 1944 year of birth - already 79 years or still 78 years.
If 1964 year of birth - already 59 years or still 58 years.
If 1984 year of birth - already 39 years or still 38 years.
If 2014 year of birth - already 9 years or still 8 years.

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