1904 year born – age now in 2025?

How old am I in 2025 if I was born in 1904? Today's date is - 18 January 2025.

If year of birth - 1904, he is now:
120 years old or 121 years old*

*Depends on before or after 18 January 1904 year he was born.

If a person was born from January 1 1904 to 18 January 1904 inclusively, he is 121 year old now, otherwise, if after 18 January 1904 (until December 31 1904 inclusively), then he is still 120 years old now.

Other examples:

If 1911 year of birth - already 114 years or still 113 years.
If 1961 year of birth - already 64 years or still 63 years.
If 1982 year of birth - already 43 years or still 42 years.
If 2023 year of birth - already 2 years or still 1 years.

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