The organizers don´t recommend the show for children under 8. I took my 5 year-old and she was fine, but she´s a very brave little girl. With plenty of coaxing and reassuring, I think 6 and over would be ok. You know your own child best – if they scare easily then ask to do a micro-version of the tour, with just one or two rooms so you can beat a retreat before you´re lost in the labyrinth. Ask to be allowed to go out and back in – kids sometimes just need to try something a few times and know they can exit if they want to. I know what works for my own child, in terms of making her feel safe – reassuring voice, going slow, holding hands. I focused on appealing to her sense of wonder and complimented her on recognizing the objects we felt, rather than letting her start to worry about how long we were “stuck” in there. But if your child (or you, for that matter) is prone to panic attacks I´d give the show a miss, no matter what your age.