2021 year born – age now in 2022?

How old am I in 2022 if I was born in 2021? Today's date is - 3 December 2022.

If year of birth - 2021, he is now:
0 years old or 1 years old*

*Depends on before or after 3 December 2021 year he was born.

If a person was born from January 1 2021 to 3 December 2021 inclusively, he is 1 year old now, otherwise, if after 3 December 2021 (until December 31 2021 inclusively), then he is still 0 years old now.

Other examples:

If 1921 year of birth - already 101 years or still 100 years.
If 1951 year of birth - already 71 years or still 70 years.
If 1985 year of birth - already 37 years or still 36 years.
If 2012 year of birth - already 10 years or still 9 years.

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