Kids World (2001)

Ryan Mitchell's parents don't understand him. His teenage brother constantly blames him for the bad things he's done. And to top it all off, the girl he's in love with is dating the local bully. One day, after being chased by the bully, Ryan stumbles upon an ancient Navajo burial ground where he finds a witchdoctor's Wishing Glass. He promptly wishes for a world with no parents and no teenagers. Soon, the adults disappear and it's "Kids World," - nobody over the age of twelve anywhere! But is this world more than Ryan bargained for? Soon, other kids start disappearing also, and then things take an even more serious turn when local bully Detloff gets hold of the Wishing Glass.