2015 year born – age now in 2022?

How old am I in 2022 if I was born in 2015? Today's date is - 3 December 2022.

If year of birth - 2015, he is now:
6 years old or 7 years old*

*Depends on before or after 3 December 2015 year he was born.

If a person was born from January 1 2015 to 3 December 2015 inclusively, he is 7 years old now, otherwise, if after 3 December 2015 (until December 31 2015 inclusively), then he is still 6 years old now.

Other examples:

If 1943 year of birth - already 79 years or still 78 years.
If 1954 year of birth - already 68 years or still 67 years.
If 1979 year of birth - already 43 years or still 42 years.
If 2009 year of birth - already 13 years or still 12 years.

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