Talk to educators. Kids know a lot. I agree it is graphic, which is why I thought 15 and older (and was excluding my soon to be 14 y/o son.
Some thoughts, not 100% sure about any of these, just musing:
1. It depends on the child, not just their age, but maturity level and the strength to digest something so intense and get the right message without being harmed by it.
2. This particular piece might be more pertinent to girls than boys, once again I’m not sure.
3. This might be a question for a mashpia. Generally speaking, I think survivors should be a part of the discussion about community response to CSA. Along with Rabonnim, therapists, leaders, educators, and askonim. The latter parties bring a certain objectivity to things, and that includes when/what/how to tell children.
4. You’re giving me anxiety about bez”h parenting teenagers one day, but one can’t begin preparing early enough. Let’s hope I’m wiser and have more bitachon when that time comes.