Why hasn't Prince Charles become the king?

His Royal Highness Prince Charles will become king on the death or abdication of his mother, Queen Elizabeth II. It is thought extremely unlikely that she will abdicate, that is to give up being Queen voluntarily. Charles' full names are "Charles Phillip Arthur George" and, while he could choose any of these names - or any name at all -he will probably become King Charles III. The story that he would become King George VII appeared in the British newspapers in December 2005 and was denied a few days later by official sources who said that no decision has yet been made about what his title will be. If Charles were to die before his mother, the next person in line to the throne is his eldest son, Prince William.