Well, despite the fact the fact that the stated age in the YouTube profile was 21, they certainly looked 16 to me. YouTube has plenty of tickling, bondage, and bondage tickling videos available, including stuff involving minors. I would imagine that the kids' parents are responsible for taking these videos down. The "Tickle Challenge" had hits numbering in the tens of thousands, exceeding the hits on their other challenges by about a hundred to one. And, let's be honest, it wasn't receiving that high number of hits for being cute and adorable, but, I'm sure, for being an erotic stimulus. If they were my kids, I'd want those videos taken down, too.
There's lot of good stuff on YouTube, and new stuff gets added all the time. Let's just let the kids be a few years older, huh?