1974 year born – age now in 2023?

How old am I in 2023 if I was born in 1974? Today's date is - 22 March 2023.

If year of birth - 1974, he is now:
48 years old or 49 years old*

*Depends on before or after 22 March 1974 year he was born.

If a person was born from January 1 1974 to 22 March 1974 inclusively, he is 49 years old now, otherwise, if after 22 March 1974 (until December 31 1974 inclusively), then he is still 48 years old now.

Other examples:

If 1939 year of birth - already 84 years or still 83 years.
If 1954 year of birth - already 69 years or still 68 years.
If 1978 year of birth - already 45 years or still 44 years.
If 2022 year of birth - already 1 years or still 0 years.

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