What would happen if all the adults disappeared?

Like the question, this is more of just a curiousity survey. You can give me a personal account of what YOU would do, what would happen to the world in general, how life would either flourish or fall, etc. etc. etc. BTW, lets just put the oldest people at the age of 23. Any older, and they're gone. This is also for a small project im doing, so try to be as realistic as possible.