Thanks paradox, i was also looking for that info for my mom. May i ask where did you see that info? I could only find 65/20 exemption but nowhere wjere it says they wxempt from civic test totally.
From uscis website: The Immigration and Nationality Act provides for special consideration of the civics test for applicants who, at the time of filing their Form N-400, Application for Naturalization, are over 65 years old and have been a permanent resident for at least 20 years. These applicants qualify to take the civics test in the language of their choice. They are also given special consideration as they are only required to study 20 of the 100 civics test questions for the naturalization test.