The bit of the JKR interview I found most interesting was the question about pre-Hogwarts schooling: wizard children can either go to Muggle primary schools or be taught at home, as the Weasleys were. How would sending your kids to Muggle school work? How do you keep a child of five or six from talking about magic? Or do they just assume that nobody will believe the kid if he does?

This piece of information demonstrates for me what I think people really, secretly found so upsetting about that interview: that the creator of the Harry Potter series is not nearly as invested in that fictional universe as its fans are. I really think that at this point, she doesn't give a shit whether she can keep the Weasley kids' ages straight; she just cranks out the prose and waits for the money to roll in.