1943 year born – age now in 2023?

How old am I in 2023 if I was born in 1943? Today's date is - 1 December 2023.

If year of birth - 1943, he is now:
79 years old or 80 years old*

*Depends on before or after 1 December 1943 year he was born.

If a person was born from January 1 1943 to 1 December 1943 inclusively, he is 80 years old now, otherwise, if after 1 December 1943 (until December 31 1943 inclusively), then he is still 79 years old now.

Other examples:

If 1922 year of birth - already 101 years or still 100 years.
If 1957 year of birth - already 66 years or still 65 years.
If 1987 year of birth - already 36 years or still 35 years.
If 2020 year of birth - already 3 years or still 2 years.

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