I believe there is an unwritten law that states all pilots take measures necessary to share their love of flying and pass it on to the next generation. If a passenger wanted to check out the cockpit and listen in on the radios while flying then I'd be more than happy to let em. It's more difficult these days since you can't have in flight visitors on airliners. Also, keep in mind that the flight crew is busy trying to get the airplane out on time and there are plenty of tasks to accomplish before pulling out of the gate.

Even at twice your age I still enjoy sneaking a peak inside the flight decks of aircraft at airshows and the other week when flying back from the Middle East to Ramstein Air Base on a C-17 I asked the crew if I could jump seat. They let me and eventhough I had been up for 18 hours before the plane took off I stayed up for the entire 7 hour flight.