I am 74 and for a few years had suffered from repeated UTI's. Usually about 6 per year. I got a bidet about a year ago, use it each and every time I go to the toilet and never had a UTI since.
I have encouraged my Doc to tell all of her patients with UTI's to get a bidet. I had read it on the internet somewhere that the majority of UTI's are because of E.coli.