Show Off, The/ The Plastic Age (1926) Rating: Starring: Clara Bow, Louise Brooks, Mary Alden, Clark Gable, C.W. Goodrich, Donald Keith, Gregory Kelly, Claire McDowell, Gilbert Roland, Ford Sterling, Henry B. Walthall, Lois Wilson Director: Wesley Ruggles, Mal St. Clair Category: Comedy, Classics, Classics Studio: Image Ent. Subtitles: [None] Length: 155 mins     Idols Of The Jazz Age A double feature, each starring an icon of the 1920s:Legendary Louise Brooks' appearance in The Show Off gives this well-made Paramount programmer most of its latter-day appeal, but the film is also well worthwhile for other reasons.Clara Bow as a fast-living jazz baby with a heart of gold ignites the screen in The Plastic Age, a raucous collegiate comedy of Prohibition era youth. Louise Brooks has been canonized for her unself-conscious sexual allure, a quality recognized by German director G.W. Pabst, who cast her as femme fatale Lulu in Pandora's Box.Only two years earlier, however, Brooks was in supporting roles such as this fetching girl-next-door who steals every scene she's in.Her movie neighbor, Lois Wilson, plays Amy Fisher, the gullible fianc