2021 year born – age now in 2023?

How old am I in 2023 if I was born in 2021? Today's date is - 22 March 2023.

If year of birth - 2021, he is now:
1 years old or 2 years old*

*Depends on before or after 22 March 2021 year he was born.

If a person was born from January 1 2021 to 22 March 2021 inclusively, he is 2 years old now, otherwise, if after 22 March 2021 (until December 31 2021 inclusively), then he is still 1 years old now.

Other examples:

If 1916 year of birth - already 107 years or still 106 years.
If 1958 year of birth - already 65 years or still 64 years.
If 1995 year of birth - already 28 years or still 27 years.
If 2004 year of birth - already 19 years or still 18 years.

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