2001 year born – age now in 2025?

How old am I in 2025 if I was born in 2001? Today's date is - 23 January 2025.

If year of birth - 2001, he is now:
23 years old or 24 years old*

*Depends on before or after 23 January 2001 year he was born.

If a person was born from January 1 2001 to 23 January 2001 inclusively, he is 24 years old now, otherwise, if after 23 January 2001 (until December 31 2001 inclusively), then he is still 23 years old now.

Other examples:

If 1919 year of birth - already 106 years or still 105 years.
If 1966 year of birth - already 59 years or still 58 years.
If 1976 year of birth - already 49 years or still 48 years.
If 2009 year of birth - already 16 years or still 15 years.

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