2009 year born – age now in 2023?

How old am I in 2023 if I was born in 2009? Today's date is - 23 September 2023.

If year of birth - 2009, he is now:
13 years old or 14 years old*

*Depends on before or after 23 September 2009 year he was born.

If a person was born from January 1 2009 to 23 September 2009 inclusively, he is 14 years old now, otherwise, if after 23 September 2009 (until December 31 2009 inclusively), then he is still 13 years old now.

Other examples:

If 1918 year of birth - already 105 years or still 104 years.
If 1957 year of birth - already 66 years or still 65 years.
If 1988 year of birth - already 35 years or still 34 years.
If 2022 year of birth - already 1 years or still 0 years.

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