When I am cast in a movie where I feel that the woman's part is more interesting I usually start thinking about Spencer Tracy and Fred Astaire. They seem to be the most clear actors when working with women.
To make a love story you need a couple of young people but to reflect on the nature of love you're better off with old ones. That is a fact of life and literature - and of the novel ever since it fell in love with love in the 18th century.