Question: Which film has the director who is older than the other, Christian Wahnschaffe or Khartoum (Film)? 
Sentence (from "Khartoum (film)"): The film had its Royal World Premiere at the Casino Cinerama Theatre, in the West End of London, on 9 June 1966, in the presence of H.R.H. Princess Margaret, Countess of Snowdon, and the Earl of Snowdon.
Relevant evidence: No