33 years old now in 2023 - what year born?

Today, 5 June 2023 if a person is 33 years old now, what year was he born? See below:

If 33 years old, year of birth is:
1989 or 1990*

*It depends on whether he was born before or after 1 January 1990.

If now 33 years and his year of birth 1989 if he was born after 5 June 1989 until 31 december 1989 inclusively, and his year of birth is 1990 if he was born from 1 January 1990 to 5 June 1990.

Other examples:

If now 3 years, year of birth 2019 or 2020
If now 13 years, year of birth 2009 or 2010
If now 27 years, year of birth 1995 or 1996
If now 93 years, year of birth 1929 or 1930

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