Funny Face, the 1957 romantic musical comedy written by Leonard Gershe and Stanley Donen, stars the unlikely couple of Audrey Hepburn, a 28-year-old fresh-faced beauty, opposite Fred Astaire, a 58-year-old former Vaudeville dancer. An age gap like this might seem creepy today, but in the Golden Age of Hollywood, moviegoers were used to seeing on-screen…