2001 year born – age now in 2023?

How old am I in 2023 if I was born in 2001? Today's date is - 26 March 2023.

If year of birth - 2001, he is now:
21 years old or 22 years old*

*Depends on before or after 26 March 2001 year he was born.

If a person was born from January 1 2001 to 26 March 2001 inclusively, he is 22 years old now, otherwise, if after 26 March 2001 (until December 31 2001 inclusively), then he is still 21 years old now.

Other examples:

If 1921 year of birth - already 102 years or still 101 years.
If 1972 year of birth - already 51 years or still 50 years.
If 1978 year of birth - already 45 years or still 44 years.
If 2014 year of birth - already 9 years or still 8 years.

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