41 years old now in 2025 - what year born?

Today, 5 December 2025 if a person is 41 years old now, what year was he born? See below:

If 41 years old, year of birth is:
1983 or 1984*

*It depends on whether he was born before or after 1 January 1984.

If now 41 years and his year of birth 1983 if he was born after 5 December 1983 until 31 december 1983 inclusively, and his year of birth is 1984 if he was born from 1 January 1984 to 5 December 1984.

Other examples:

If now 7 years, year of birth 2017 or 2018
If now 16 years, year of birth 2008 or 2009
If now 27 years, year of birth 1997 or 1998
If now 45 years, year of birth 1979 or 1980

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