91 years old now in 2024 - what year born?

Today, 10 October 2024 if a person is 91 years old now, what year was he born? See below:

If 91 years old, year of birth is:
1932 or 1933*

*It depends on whether he was born before or after 1 January 1933.

If now 91 years and his year of birth 1932 if he was born after 10 October 1932 until 31 december 1932 inclusively, and his year of birth is 1933 if he was born from 1 January 1933 to 10 October 1933.

Other examples:

If now 11 years, year of birth 2012 or 2013
If now 15 years, year of birth 2008 or 2009
If now 28 years, year of birth 1995 or 1996
If now 32 years, year of birth 1991 or 1992

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