2021 year born – age now in 2025?

How old am I in 2025 if I was born in 2021? Today's date is - 16 January 2025.

If year of birth - 2021, he is now:
3 years old or 4 years old*

*Depends on before or after 16 January 2021 year he was born.

If a person was born from January 1 2021 to 16 January 2021 inclusively, he is 4 years old now, otherwise, if after 16 January 2021 (until December 31 2021 inclusively), then he is still 3 years old now.

Other examples:

If 1943 year of birth - already 82 years or still 81 years.
If 1951 year of birth - already 74 years or still 73 years.
If 1978 year of birth - already 47 years or still 46 years.
If 2022 year of birth - already 3 years or still 2 years.

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