33 years old now in 2024 - what year born?

Today, 15 October 2024 if a person is 33 years old now, what year was he born? See below:

If 33 years old, year of birth is:
1990 or 1991*

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

If now 33 years and his year of birth 1990 if he was born after 15 October 1990 until 31 december 1990 inclusively, and his year of birth is 1991 if he was born from 1 January 1991 to 15 October 1991.

Other examples:

If now 11 years, year of birth 2012 or 2013
If now 13 years, year of birth 2010 or 2011
If now 29 years, year of birth 1994 or 1995
If now 80 years, year of birth 1943 or 1944

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