41 years old now in 2022 - what year born?

Today, 27 September 2022 if a person is 41 years old now, what year was he born? See below:

If 41 years old, year of birth is:
1980 or 1981*

*It depends on whether he was born before or after 1 January 1981.

If now 41 years and his year of birth 1980 if he was born after 27 September 1980 until 31 december 1980 inclusively, and his year of birth is 1981 if he was born from 1 January 1981 to 27 September 1981.

Other examples:

If now 6 years, year of birth 2015 or 2016
If now 16 years, year of birth 2005 or 2006
If now 30 years, year of birth 1991 or 1992
If now 68 years, year of birth 1953 or 1954

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