I have experience with just the opposite. We had a child that was a year too young for edge, and had previously done the club/lab and was bored with them. Without hesitation, and without even seeing the child, there was a clipboard and waiver ready to sign saying we would allow the child into the Edge.
When we asked about this PRE-sailing.. they said 'no' and also used the excuse around capacities, etc.. but talking with people they said you can deal with it on embarkment by going to the club itself. Which is exactly what we did, and had no problem at all. I expect Vibe may be more strict, or there may be more screening on why before they might make a decision. But I know for the 'near the line' age for Edge.. it was a ZERO pain issue, except we didn't know either way until we were actually on the ship.
This was in 2013 on the Fantasy.. my kid was 10, and Edge required age 11.
Glad to hear it. My daughter will be 10 in December when we're going on the Fantasy. It would be a nice option to have her go to Edge.