1964 year born – age now in 2023?

How old am I in 2023 if I was born in 1964? Today's date is - 23 September 2023.

If year of birth - 1964, he is now:
58 years old or 59 years old*

*Depends on before or after 23 September 1964 year he was born.

If a person was born from January 1 1964 to 23 September 1964 inclusively, he is 59 years old now, otherwise, if after 23 September 1964 (until December 31 1964 inclusively), then he is still 58 years old now.

Other examples:

If 1925 year of birth - already 98 years or still 97 years.
If 1975 year of birth - already 48 years or still 47 years.
If 1978 year of birth - already 45 years or still 44 years.
If 2019 year of birth - already 4 years or still 3 years.

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