This user is being a creep. Not sure if y'all would consider this trolling, but, I don't think they should be looking for nine-year-olds, not that we have any on the site.
You are not obligated to answer such questions. If someone is pressuring you for private information do feel free to report them but it's not against the rules to ask vague questions.
If it makes you guys feel better we do monitor all new accounts abd and take your safety very seriously