It was a myth i dont think its an issue now because now we have many examples of mothers who gave birth to their first child when they were in their 40's ...e.g Madonna ,Susan Sarandon,Cherie Booth , wife of British Prime Minister, Tony Blair ,Brooke Shields and in our Indian film Industry we have Farah khan ,Madhuri Dixit ( she was in her mid and late 30's).And the latest is woman who was in her 70's living in rajasthan village gave birth to a healthy baby . It is a matter of personal choice not a biological burden on women.