2017 year born – age now in 2022?

How old am I in 2022 if I was born in 2017? Today's date is - 1 October 2022.

If year of birth - 2017, he is now:
4 years old or 5 years old*

*Depends on before or after 1 October 2017 year he was born.

If a person was born from January 1 2017 to 1 October 2017 inclusively, he is 5 years old now, otherwise, if after 1 October 2017 (until December 31 2017 inclusively), then he is still 4 years old now.

Other examples:

If 1919 year of birth - already 103 years or still 102 years.
If 1971 year of birth - already 51 years or still 50 years.
If 1978 year of birth - already 44 years or still 43 years.
If 2004 year of birth - already 18 years or still 17 years.

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