Hi Steven. The oldest 2 of my monkeys, who you've met on the Kaapsche Hoop hike, had no problem when we did the last hike up to the Leopards cave. The youngest of the two is now 8. But I must confess that it do take a lot of strain on your own nerves when you have to tackle some of the more serious stuff. My nr. 1 was 9 when we did our first gorge hike and had no problem with that.
I will say that if the kids are well behaved, athletic, and not easily scared, they will be fine.