I agree that it has a lot more to do with your care provider than anything else. If a woman at any age is told constantly and made to believe, whether through opinions or actions, that she will not be able to birth her baby without help or intervention, then she will believe it herself and it becomes a self-fulfilling prophecy. If she is made to feel, through words or actions, that vaginal birth is dangerous or scary, then those thoughts will stay with her - making it all the more hard for her to have confidence and belief in herself when the time comes.