2021 year born – age now in 2024?

How old am I in 2024 if I was born in 2021? Today's date is - 15 October 2024.

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

*Depends on before or after 15 October 2021 year he was born.

If a person was born from January 1 2021 to 15 October 2021 inclusively, he is 3 years old now, otherwise, if after 15 October 2021 (until December 31 2021 inclusively), then he is still 2 years old now.

Other examples:

If 1903 year of birth - already 121 years or still 120 years.
If 1962 year of birth - already 62 years or still 61 years.
If 1983 year of birth - already 41 years or still 40 years.
If 2004 year of birth - already 20 years or still 19 years.

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