32 years old now in 2023 - what year born?

Today, 22 March 2023 if a person is 32 years old now, what year was he born? See below:

If 32 years old, year of birth is:
1990 or 1991*

*It depends on whether he was born before or after 1 January 1991.

If now 32 years and his year of birth 1990 if he was born after 22 March 1990 until 31 december 1990 inclusively, and his year of birth is 1991 if he was born from 1 January 1991 to 22 March 1991.

Other examples:

If now 8 years, year of birth 2014 or 2015
If now 15 years, year of birth 2007 or 2008
If now 20 years, year of birth 2002 or 2003
If now 42 years, year of birth 1980 or 1981

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