1977 year born – age now in 2025?

How old am I in 2025 if I was born in 1977? Today's date is - 18 January 2025.

If year of birth - 1977, he is now:
47 years old or 48 years old*

*Depends on before or after 18 January 1977 year he was born.

If a person was born from January 1 1977 to 18 January 1977 inclusively, he is 48 years old now, otherwise, if after 18 January 1977 (until December 31 1977 inclusively), then he is still 47 years old now.

Other examples:

If 1909 year of birth - already 116 years or still 115 years.
If 1952 year of birth - already 73 years or still 72 years.
If 1994 year of birth - already 31 years or still 30 years.
If 2018 year of birth - already 7 years or still 6 years.

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