Ra's al Ghul tells Oliver he hasn't been challenged to trial by combat in 67 years, though he looks to be in his fifties. Ra's uses the Lazarus Pits to reset his age, heal from wounds, and even come back after death. He once even told Bruce Wayne/Batman that he was over 600 years old.
The literal translations for the characters' names from Arabic are; Ra's al Ghul: head of ogre, Ta-er Al-Sahfer: yellow bird, and Sarab: Mirage.
Ra's al Ghul is a comic book villain who made his debut in Batman #232 (June 1971). He is known for near immortality due to the rejuvenating powers of the Lazarus Pits that he submerges himself into. This longevity has made him into a master combatant and leader of the League of Assassins.
This is the highest rated episode of season 3 and the was highest rated episode of the whole series until the season 5 finale
Marc Guggenheim gave the Olicity scene a 9 out of 10. When asked why it wasn't a 10 he said "no sex".