On 20th November 1947, at the age of 20, Elizabeth II got married to the son of Prince Andrew of Greece - Prince Philip in Westminster Abbey. They have four kids together: Prince Charles (1948), Princess Anne (1950), Prince Andrew (1960) and Prince Edward (1964).

Prince Charles, the oldest son of Queen Elizabeth II is the next in line to the throne. His son Prince William is the second in line to the throne. Prince Charles is 63 years old as of today (28th May 2012), and is the longest waiting heir apparent in British Monarch history.

For the full list of the line of succession to the throne, check here.