1943 year born – age now in 2023?

How old am I in 2023 if I was born in 1943? Today's date is - 27 March 2023.

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

*Depends on before or after 27 March 1943 year he was born.

If a person was born from January 1 1943 to 27 March 1943 inclusively, he is 80 years old now, otherwise, if after 27 March 1943 (until December 31 1943 inclusively), then he is still 79 years old now.

Other examples:

If 1921 year of birth - already 102 years or still 101 years.
If 1971 year of birth - already 52 years or still 51 years.
If 1977 year of birth - already 46 years or still 45 years.
If 2018 year of birth - already 5 years or still 4 years.

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