In this video, the kids were 7. That is probably the youngest that should attempt it. The two biggest factors are reach and stamina. They must be able to have a reach of 62 inches so they unclip the tethers. The next is stamina. It is about 3-4 hours of hiking and climbing. There are early exit points if needed. Another piece to consider is that kids will need to be belayed. The tethers used to absorb the shock of an accidental fall does not fully function with lighter-weight kids. If the concept of belaying is unfamiliar, then I would recommend Basecamp in Ouray as a guide. They will make sure the kids have a good and safe time!