What are the consquences of delaying the decision to have chidlren?

We are all so used to having more choices and being able to do so much more than previous generations did.   One thing that has remained unchanged is our biology - we simply can not get away from the fact that our fertitlity does decrease from 35 and then rapidly from 40.  Although IVF and technology can help, as this article points out, it's important to know the consquences of delaying the decision to have a child.  Of course, for those who are open to adoption, there are not the same time limitations

http://www.theglobeandmail.com/life/health-and-fitness/health-advisor/plan-to-delay-having-a-baby-make-sure-you-understand-the-consequences-before-its-too-late/article19080910/