FILE - In this June 9, 1937 file photo, then Britain's Queen Elizabeth, left, with Queen Mary, second left, and Princesses Elizabeth, nearest camera, and Princess Margaret, obscured right, driving from Buckingham Palace to the Horse Guards Parade for the Trooping of the Colour ceremony, in London. Britain's Queen Elizabeth celebrates her 90th birthday on Thursday, April 21, 2016. (AP Photo/Len Putnam, file)