The Welsh star is on a mission to prove that women of her age can act just as well as their younger colleagues, and is determined to still land "juicy" roles.
She said: "I`m out to prove 40 year olds can do it just as well as 20-somethings ever did. I`m not going out to pasture. I`m going after the juicy roles and I intend to prove older women have just as much strength in Hollywood as young women and men.
"It`s a natural progression. I`m going to play more mums than sex symbols. A lot of people talk about how hard it is to find good roles for older women but I, frankly, haven`t found that. I`ve actually seen an influx of interesting and compelling roles that makes me confident that this over-40 myth in Hollywood is just that."
To stop her movie career slowing down, Catherine admits she has taken it into her own hands to finds roles suitable for her.
She told the Mirror: "I`m 40 and although I don`t think I feel or look it, there`s a stigma attached to a woman`s age. When you think of the box office hits, they star the younger ingenues and that`s the reality. As you get older, the roles become thinner or not so accessible. You have to take it into your own hands and look for the roles."