41 years old now in 2025 - what year born?

Today, 23 January 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 23 January 1983 until 31 december 1983 inclusively, and his year of birth is 1984 if he was born from 1 January 1984 to 23 January 1984.

Other examples:

If now 9 years, year of birth 2015 or 2016
If now 16 years, year of birth 2008 or 2009
If now 20 years, year of birth 2004 or 2005
If now 55 years, year of birth 1969 or 1970

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