Question: Which film has the director who is older than the other, What'S Up Superdoc! or Secret Beyond The Door? 
Sentence (from "What's Up Superdoc!"): What's Up Superdoc! is a 1978 British sex comedy film, directed by Derek Ford and starring Harry H. Corbett, Christopher Mitchell, Melvyn Hayes, Julia Goodman, Hughie Green, Bill Pertwee, Angela Grant, Chic Murray, Beth Porter and Sheila Steafel.
Relevant evidence: Yes