2003 year born – age now in 2023?

How old am I in 2023 if I was born in 2003? Today's date is - 22 March 2023.

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

*Depends on before or after 22 March 2003 year he was born.

If a person was born from January 1 2003 to 22 March 2003 inclusively, he is 20 years old now, otherwise, if after 22 March 2003 (until December 31 2003 inclusively), then he is still 19 years old now.

Other examples:

If 1940 year of birth - already 83 years or still 82 years.
If 1955 year of birth - already 68 years or still 67 years.
If 1991 year of birth - already 32 years or still 31 years.
If 2021 year of birth - already 2 years or still 1 years.

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