41 years old now in 2023 - what year born?

Today, 5 June 2023 if a person is 41 years old now, what year was he born? See below:

If 41 years old, year of birth is:
1981 or 1982*

*It depends on whether he was born before or after 1 January 1982.

If now 41 years and his year of birth 1981 if he was born after 5 June 1981 until 31 december 1981 inclusively, and his year of birth is 1982 if he was born from 1 January 1982 to 5 June 1982.

Other examples:

If now 4 years, year of birth 2018 or 2019
If now 14 years, year of birth 2008 or 2009
If now 27 years, year of birth 1995 or 1996
If now 33 years, year of birth 1989 or 1990

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