91 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 91 years old now, what year was he born? See below:

If 91 years old, year of birth is:
1934 or 1935*

*It depends on whether he was born before or after 1 January 1935.

If now 91 years and his year of birth 1934 if he was born after 28 October 1934 until 31 december 1934 inclusively, and his year of birth is 1935 if he was born from 1 January 1935 to 28 October 1935.

Other examples:

If now 6 years, year of birth 2019 or 2020
If now 13 years, year of birth 2012 or 2013
If now 24 years, year of birth 2001 or 2002
If now 33 years, year of birth 1992 or 1993

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