1900 year born – age now in 2024?

How old am I in 2024 if I was born in 1900? Today's date is - 15 October 2024.

If year of birth - 1900, he is now:
123 years old or 124 years old*

*Depends on before or after 15 October 1900 year he was born.

If a person was born from January 1 1900 to 15 October 1900 inclusively, he is 124 years old now, otherwise, if after 15 October 1900 (until December 31 1900 inclusively), then he is still 123 years old now.

Other examples:

If 1920 year of birth - already 104 years or still 103 years.
If 1959 year of birth - already 65 years or still 64 years.
If 1983 year of birth - already 41 years or still 40 years.
If 2023 year of birth - already 1 years or still 0 years.

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