1983 year born – age now in 2025?

How old am I in 2025 if I was born in 1983? Today's date is - 18 January 2025.

If year of birth - 1983, he is now:
41 years old or 42 years old*

*Depends on before or after 18 January 1983 year he was born.

If a person was born from January 1 1983 to 18 January 1983 inclusively, he is 42 years old now, otherwise, if after 18 January 1983 (until December 31 1983 inclusively), then he is still 41 years old now.

Other examples:

If 1946 year of birth - already 79 years or still 78 years.
If 1968 year of birth - already 57 years or still 56 years.
If 1984 year of birth - already 41 years or still 40 years.
If 2023 year of birth - already 2 years or still 1 years.

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