42 years old now in 2023 - what year born?

Today, 22 March 2023 if a person is 42 years old now, what year was he born? See below:

If 42 years old, year of birth is:
1980 or 1981*

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

If now 42 years and his year of birth 1980 if he was born after 22 March 1980 until 31 december 1980 inclusively, and his year of birth is 1981 if he was born from 1 January 1981 to 22 March 1981.

Other examples:

If now 10 years, year of birth 2012 or 2013
If now 15 years, year of birth 2007 or 2008
If now 28 years, year of birth 1994 or 1995
If now 63 years, year of birth 1959 or 1960

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