With more than 70 theatrical works and a handful of screenplays to his credit, Israel Horovitz knows a thing or two about building a script. That's evident in his film directorial debut, "My Old Lady," based on his 2002 play. It's the work of a man immersed in the stage. Although the film is capably made, its roots in the theater are clear - there's lots to enjoy, but it has a slightly old-school, musty feeling about it. The central figure, Mathias (Kevin Kline), a rumpled American in his late 50s, is newly arrived in Paris.