2018 year born – age now in 2022?

How old am I in 2022 if I was born in 2018? Today's date is - 8 December 2022.

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

*Depends on before or after 8 December 2018 year he was born.

If a person was born from January 1 2018 to 8 December 2018 inclusively, he is 4 years old now, otherwise, if after 8 December 2018 (until December 31 2018 inclusively), then he is still 3 years old now.

Other examples:

If 1911 year of birth - already 111 years or still 110 years.
If 1963 year of birth - already 59 years or still 58 years.
If 1986 year of birth - already 36 years or still 35 years.
If 2013 year of birth - already 9 years or still 8 years.

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