Eric, every source I have seen says that you do not have to sit a formal language test over 60. A friend got citizenship last year, she did not sit a test, but had, as seems to be standard, an interview with the gendarmes and an interview at the préfecture. I have read lots of reports of the préfecture interviews and most seem to include discussion of the responsibilities of French citizens, key moments in history (mostly around the Revolution), understanding of the implications of la devise, contribution to French life, knowledge of French culture etc. You would need to be at B1 for all this, obviously. There is information on the RIFT site and also a Facebook group for those seeking citizenship.