1972 year born – age now in 2023?

How old am I in 2023 if I was born in 1972? Today's date is - 7 December 2023.

If year of birth - 1972, he is now:
50 years old or 51 years old*

*Depends on before or after 7 December 1972 year he was born.

If a person was born from January 1 1972 to 7 December 1972 inclusively, he is 51 year old now, otherwise, if after 7 December 1972 (until December 31 1972 inclusively), then he is still 50 years old now.

Other examples:

If 1900 year of birth - already 123 years or still 122 years.
If 1971 year of birth - already 52 years or still 51 years.
If 1987 year of birth - already 36 years or still 35 years.
If 1996 year of birth - already 27 years or still 26 years.

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