1900 year born – age now in 2023?

How old am I in 2023 if I was born in 1900? Today's date is - 1 December 2023.

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

*Depends on before or after 1 December 1900 year he was born.

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

Other examples:

If 1922 year of birth - already 101 years or still 100 years.
If 1952 year of birth - already 71 years or still 70 years.
If 1983 year of birth - already 40 years or still 39 years.
If 1997 year of birth - already 26 years or still 25 years.

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