2021 year born – age now in 2023?

How old am I in 2023 if I was born in 2021? Today's date is - 23 September 2023.

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

*Depends on before or after 23 September 2021 year he was born.

If a person was born from January 1 2021 to 23 September 2021 inclusively, he is 2 years old now, otherwise, if after 23 September 2021 (until December 31 2021 inclusively), then he is still 1 years old now.

Other examples:

If 1921 year of birth - already 102 years or still 101 years.
If 1961 year of birth - already 62 years or still 61 years.
If 1995 year of birth - already 28 years or still 27 years.
If 2014 year of birth - already 9 years or still 8 years.

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