2012 year born – age now in 2023?

How old am I in 2023 if I was born in 2012? Today's date is - 24 September 2023.

If year of birth - 2012, he is now:
10 years old or 11 years old*

*Depends on before or after 24 September 2012 year he was born.

If a person was born from January 1 2012 to 24 September 2012 inclusively, he is 11 years old now, otherwise, if after 24 September 2012 (until December 31 2012 inclusively), then he is still 10 years old now.

Other examples:

If 1943 year of birth - already 80 years or still 79 years.
If 1974 year of birth - already 49 years or still 48 years.
If 1981 year of birth - already 42 years or still 41 years.
If 2022 year of birth - already 1 years or still 0 years.

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