Queen Elizabeth II and Prince Philip had a love story for the ages. ET is looking back at the couple's romance following Her Majesty's death on Thursday at age 96. Philip died on April 9, 2021, at age 99.Elizabeth and Philip, who were married for 73 years, welcomed four children together and stayed by each other's side for many historical and personal events of the last century. Their romance started when Elizabeth was just 13 years old and continued until Philip's death. Look back at how it all began and the journey of the most successful royal couple:Elizabeth first met Philip in 1939 when she was just 13 years old.