Next British monarch odds

Queen Elizabeth II has reigned since February 6, 1952 as the Queen of the United Kingdom and other Commonwealth countries.

On September 9, 2015, at the age of 89, she became the longest-reigning British monarch and the longest-reigning female monarch in world history, pipping Queen Victoria to the post, who held the throne for 63 years and 216 days.

With the Queen holding the throne for so long there has been speculation into who the next British Monarch will be. Prince Charles is currently next in line to the throne but at 68, would he choose to pass on the responsibility to William?