My daughter was a little younger than that when we bought a pile of dead DVD drives and disassembled them. Then we build a little driver circuit and hooked a laser diode to it. She was so excited to come home and take those drives apart after school. She learned about how things come apart, the importance of eye protection, how to use basic hand tools, and a little bit about electronics (I am self-taught and my knowledge is super uneven so I'm not the best teacher for that).