1984 year born – age now in 2024?

How old am I in 2024 if I was born in 1984? Today's date is - 15 October 2024.

If year of birth - 1984, he is now:
39 years old or 40 years old*

*Depends on before or after 15 October 1984 year he was born.

If a person was born from January 1 1984 to 15 October 1984 inclusively, he is 40 years old now, otherwise, if after 15 October 1984 (until December 31 1984 inclusively), then he is still 39 years old now.

Other examples:

If 1924 year of birth - already 100 years or still 99 years.
If 1973 year of birth - already 51 years or still 50 years.
If 1987 year of birth - already 37 years or still 36 years.
If 2006 year of birth - already 18 years or still 17 years.

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