Film makers are beginning to address the habitual casting of old male actors and much younger female leads, the range of movies on show at the recent Sundance festival suggested. Examples were 62 years old Emma Thompson playing opposite Daryl McCormack, 29, in Good Luck to You, Leo Grande, and Cha Cha Real Smooth, which centred on the relationship between a college leaver and a 30-something divorcee.(Accompanying still from Good Luck to You, Leo Grande courtesy Sundance Film Festival)