1900 year born – age now in 2023?

How old am I in 2023 if I was born in 1900? Today's date is - 22 March 2023.

If year of birth - 1900, he is now:
122 years old or 123 years old*

*Depends on before or after 22 March 1900 year he was born.

If a person was born from January 1 1900 to 22 March 1900 inclusively, he is 123 years old now, otherwise, if after 22 March 1900 (until December 31 1900 inclusively), then he is still 122 years old now.

Other examples:

If 1926 year of birth - already 97 years or still 96 years.
If 1958 year of birth - already 65 years or still 64 years.
If 1994 year of birth - already 29 years or still 28 years.
If 1997 year of birth - already 26 years or still 25 years.

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