I did career day at my daughter's school, when she was in 4th grade (ages 9-11). It was interesting that the kids were far more interested in computers than in robotics. They were even more interested in gaming, which I kind of expected (be prepared to weigh in on which console you prefer, and expect to have at least one of the kids tell you your choice sucks).

I'd recommend it for any technical parent - what you do is definitely cooler than being a lawyer. =P