2011 year born – age now in 2023?

How old am I in 2023 if I was born in 2011? Today's date is - 24 September 2023.

If year of birth - 2011, he is now:
11 years old or 12 years old*

*Depends on before or after 24 September 2011 year he was born.

If a person was born from January 1 2011 to 24 September 2011 inclusively, he is 12 years old now, otherwise, if after 24 September 2011 (until December 31 2011 inclusively), then he is still 11 years old now.

Other examples:

If 1947 year of birth - already 76 years or still 75 years.
If 1964 year of birth - already 59 years or still 58 years.
If 1976 year of birth - already 47 years or still 46 years.
If 2003 year of birth - already 20 years or still 19 years.

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