By the way, I had a kid's class working on testing one-point at the shoulder (one spot we normally do it), then moved out to the bent arm and did it again. Then added the light pull and had them focus on what was happening in their bodies and how they could ground both. Some of the the kids pick it up a faster than us old farts...
But the kids are "tighter" and more pliable than the old guys. As a person gets older his "suit" degrades and gets leaky (and other things, but enough), etc. Hence the idea generally that we lose our qi as we get older. So a kid being naturally "tighter" than an older person... that's to be expected.