2005 year born – age now in 2023?

How old am I in 2023 if I was born in 2005? Today's date is - 1 December 2023.

If year of birth - 2005, he is now:
17 years old or 18 years old*

*Depends on before or after 1 December 2005 year he was born.

If a person was born from January 1 2005 to 1 December 2005 inclusively, he is 18 years old now, otherwise, if after 1 December 2005 (until December 31 2005 inclusively), then he is still 17 years old now.

Other examples:

If 1940 year of birth - already 83 years or still 82 years.
If 1961 year of birth - already 62 years or still 61 years.
If 1976 year of birth - already 47 years or still 46 years.
If 2012 year of birth - already 11 years or still 10 years.

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