2018 year born – age now in 2023?

How old am I in 2023 if I was born in 2018? Today's date is - 22 March 2023.

If year of birth - 2018, he is now:
4 years old or 5 years old*

*Depends on before or after 22 March 2018 year he was born.

If a person was born from January 1 2018 to 22 March 2018 inclusively, he is 5 years old now, otherwise, if after 22 March 2018 (until December 31 2018 inclusively), then he is still 4 years old now.

Other examples:

If 1939 year of birth - already 84 years or still 83 years.
If 1958 year of birth - already 65 years or still 64 years.
If 1980 year of birth - already 43 years or still 42 years.
If 2003 year of birth - already 20 years or still 19 years.

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