1983 year born – age now in 2023?

How old am I in 2023 if I was born in 1983? Today's date is - 23 September 2023.

If year of birth - 1983, he is now:
39 years old or 40 years old*

*Depends on before or after 23 September 1983 year he was born.

If a person was born from January 1 1983 to 23 September 1983 inclusively, he is 40 years old now, otherwise, if after 23 September 1983 (until December 31 1983 inclusively), then he is still 39 years old now.

Other examples:

If 1912 year of birth - already 111 years or still 110 years.
If 1971 year of birth - already 52 years or still 51 years.
If 1991 year of birth - already 32 years or still 31 years.
If 1998 year of birth - already 25 years or still 24 years.

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