Parent 1: Ten years ago, children in communities like ours did not date until they were thirteen to fifteen years old.
Evaluate
Parent 2 is offering a different causal explanation for why there's an uptick in 9-11 year olds dating. We often refer to these as "Curious Facts".
Why, over the last ten years, has it started happening that 9-11 year olds are dating?
Parent 1 had a hypothesis -- children in communities like this are becoming romantically interested in members of the opposite sex at an earlier age than before.
Parent 2 had an alternative hypothesis -- no, they're no romantically interested in other people. They just feel peer pressure to act "grown up", such as by dating.
Goal
Look for any answer that matches, but it'll probably describe Parent 2's response as something like,