2002 year born – age now in 2023?

How old am I in 2023 if I was born in 2002? Today's date is - 26 September 2023.

If year of birth - 2002, he is now:
20 years old or 21 years old*

*Depends on before or after 26 September 2002 year he was born.

If a person was born from January 1 2002 to 26 September 2002 inclusively, he is 21 year old now, otherwise, if after 26 September 2002 (until December 31 2002 inclusively), then he is still 20 years old now.

Other examples:

If 1906 year of birth - already 117 years or still 116 years.
If 1956 year of birth - already 67 years or still 66 years.
If 1994 year of birth - already 29 years or still 28 years.
If 2006 year of birth - already 17 years or still 16 years.

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