85 years old now in 2026 - what year born?

Today, 28 October 2026 if a person is 85 years old now, what year was he born? See below:

If 85 years old, year of birth is:
1940 or 1941*

*It depends on whether he was born before or after 1 January 1941.

If now 85 years and his year of birth 1940 if he was born after 28 October 1940 until 31 december 1940 inclusively, and his year of birth is 1941 if he was born from 1 January 1941 to 28 October 1941.

Other examples:

If now 4 years, year of birth 2021 or 2022
If now 17 years, year of birth 2008 or 2009
If now 24 years, year of birth 2001 or 2002
If now 35 years, year of birth 1990 or 1991

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