Life Without Grown-Ups

What if we lived in a world with no adults? Well, in one word, the word would be chaos. There would be no one to make or enforce rules. There wouldn't be anyone to care for the children so they might hurt themselves or another child. If there were teenagers, they might be capable to care for some children, but teenagers running the world would have its own problems.
In a world where teenagers make the rules, there wouldn't be much equality or sense behind rules. Teenagers brains aren't adapt for extreme leadership or major decision making. Letting a group of teens run everything would become a fight for power, and be similar to giving a toddler a remote to set off a bomb. The baby might not destruct everything, but it is well within its hands to do so, and it would be most likely to press the big red button of doom and destruction.

Children and teens can not feed themselves. Though they can rob stores or find a garden, children aren't capable of keeping the world fed for long periods of time. Life with no adults might be fun for the first day or week after they disappeared, but it wouldn't be fun after we ran into problems mommy and daddy always solve for you.