Question: Which film has the director who is older than the other, City Slickers or The System Within? 
Sentence (from "City Slickers"): City Slickers is a 1991 American western comedy film, directed by Ron Underwood and starring Billy Crystal, Daniel Stern, Bruno Kirby, and Jack Palance, with supporting roles by Patricia Wettig, Helen Slater, and Noble Willingham.
Relevant evidence: Yes