Yes, my eldest is of that age.
So I'm checking out the Parental Controls ... and I discover they only go back a month. When I change the date range to anything over a month no information is displayed at all!
Since you can't export or otherwise analyze the logs they're not terribly useful anyway -- but they also don't work.
Apple really doesn't take children seriously -- I'm not sure they believe in them! This didn't used to be true -- parental features in Classic were excellent, as was Simple Finder.
None of that survived OS X, and it's clear Apple doesn't really test this stuff. I figure they put it in to keep regulators of their backs.