I'm actually surprised that some people are shocked that a 55# compound did the job on a Moose. I'm surprised that's it's an issue at all.
My personal setup for my upcoming moose trip will be my 70# longbow with a 2 bladed head and a grizzly stick. My backup will be my 60# Schulz longbow.
Currently my son is working his way up to his 40# longbow (he's still 12 and shooting 30#'s comfortably), in two years though, I'm pretty sure he'll be ready to hunt deer with it ground level up to about 20 yards. That is as long as I can get him away from hunting chip monks long enough.