1933 year born – age now in 2023?

How old am I in 2023 if I was born in 1933? Today's date is - 24 September 2023.

If year of birth - 1933, he is now:
89 years old or 90 years old*

*Depends on before or after 24 September 1933 year he was born.

If a person was born from January 1 1933 to 24 September 1933 inclusively, he is 90 years old now, otherwise, if after 24 September 1933 (until December 31 1933 inclusively), then he is still 89 years old now.

Other examples:

If 1935 year of birth - already 88 years or still 87 years.
If 1956 year of birth - already 67 years or still 66 years.
If 1983 year of birth - already 40 years or still 39 years.
If 2000 year of birth - already 23 years or still 22 years.

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