Question: Which film has the director who is older than the other, Our Idiot Brother or Stella Street? 
Sentence (from "Stella Street"): It takes the form of a mockumentary filmed on a camcorder, based on the fantastical premise that a group of British and American celebrities have all decided to move into Stella Street in Surbiton (actually Hartswood Road, London, W12).
Relevant evidence: No