How old were the actors in Chloe (2010)?

Catherine and David Stewart are a well-to-do couple living in a posh area of Toronto, but all is not well in paradise. Catherine suspects that David is cheating on her, so she hires an escort named Chloe to meet David and see if he gives in to temptation — but events spin out of control when Chloe spills the details of her torrid encounters.