33 years old now in 2023 - what year born?

Today, 2 December 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 2 December 1989 until 31 december 1989 inclusively, and his year of birth is 1990 if he was born from 1 January 1990 to 2 December 1990.

Other examples:

If now 8 years, year of birth 2014 or 2015
If now 14 years, year of birth 2008 or 2009
If now 28 years, year of birth 1994 or 1995
If now 70 years, year of birth 1952 or 1953

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