Context: The Queen surpassed her great-great-grandmother, Queen Victoria, to become the longest-lived British monarch in December 2007, and the longest-reigning British monarch on 9 September 2015. She was celebrated in Canada as the "longest-reigning sovereign in Canada's modern era". (King Louis XIV of France reigned over part of Canada for longer.) She is the longest-reigning queen regnant in history, the world's oldest reigning monarch and second-longest-serving current head of state after King Bhumibol Adulyadej of Thailand.

Question: Who did Elizabeth surpass in longest lived British monarch?
Answer: Queen Victoria

Question: What relation was Victoria to Elizabeth?
Answer: great-great-grandmother

Question: When did Elizabeth become the longest reigning monarch?
Answer: 9 September 2015

Question: In age of monarchs, what is the rank of Elizabeth's reign?
Answer: world's oldest

Question: What head of stat has served longer than Elizabeth?
Answer: King Bhumibol Adulyadej