Where to start:

• Check out the following Creating a Family radio show: 
  • April 8, 2009: How Old is Too Old to Become a Parent 

•  Creating a Family blog:
  • My blog titled "How Old is Too Old to Become a Parent

Books and Articles on Age and Parenting:

• A well reasoned and optimistic article in Good Housekeeping, Too Old to Be a Mom? Sept. 29, 2000 The article addresses the issues regardless if your child is joining your family through adoption on Assisted Reproduction Technology. Don't let the date dissuade you from reading the article, the issues have not changed in the intervening years.
• Are Some Parents Too Old? Dr. Lawrence M. Hinman, an ethic professor, presented this well reasoned discussion at the American Philosophical Association. He dissects the arguments against older parents and concludes that "none of these arguments is sufficient to establish a strong restriction on age per se, and indeed, none of these arguments proves to be genuinely age-based."
• How Old is Too Old to Become a Mom? : After 67-Year-Old Gives Birth, Fertility Experts Debate the Ethics of In Vitro Fertilization of Older Women by ABC News (Feb. 16, 2007) It may be possible to conceive through assisted reproductive technology in your 50s and 60s, but should you? What are the health risks?
• Too Old to be a Mom? A video debate between two woman with opposing views. A reproductive endocrinologist versus a 43 year old woman who just gave birth via IVF.
• GAARP: Gracefully Aging Adoptive Refined Parents. Yahoo group at www.groups.yahoo.com. A supportive forum for adoptive or would-be adoptive parents over the age of forty.