Edit 1: I'm looking more for anyone who has experience at this age or has a daughter or sister who has used them at that age as opposed to comments as I originally requested. I already have the same concerns that have been posted.
Edit 2: Via some of the responses here, I realized that I really need to reword this sentence: "I want them to use Divacups but I think they might hurt them too much." I should have written this: "I just started using the Divacup and love it. They've been asking about it and wanted to broaden my knowledge on it's use by women of their ages so I can respond to their questions from a better perspective.
Thanks to all who have and who will respond!