For nearly 50 years, Robert Redford has been on quest to prove he is more than a golden boy matinee idol.Of course, Redford has succeeded in spectacular fashion, starring in such classics as "The Candidate," "Three Days of the Condor" and "All the President's Men"; winning the Oscar for directing "Ordinary People" (somehow besting Martin Scorsese and "Raging Bull"), and founding the Sundance Film Festival.He is legend. The notion Redford became a star only because of his looks is as ludicrous as someone saying Kareem Abdul-Jabbar was a great basketball player only because of his height.Yet like so many great stars before him, Redford, now 76, steadfastly refuses to go gently into that good grandfatherhood. In "The Company You Keep," he looks and moves like a really fit, handsome 76-year-old a real distraction, given he's playing a former 1970s radical who now has an 11-year-old daughter and is living a quiet life und