Consider maintaining a library of Third Age literature and inspiring magazine articles to lend your clients as recommended reading between visits.
These five books would be a good core selection:
Bernice Bratter and Helen Dennis, Project Renewment: The First Retirement Model for Career Women (Scribner, 2008)
William A. Sadler, Ph.D., The Third Age: Six Principles for Growth and Renewal After Forty (Perseus Publishing, 2001)
William A. Sadler, Ph.D., and James H. Krefft, Ph.D., Changing Course: Navigating Life After 50 (The Center for Third Age Leadership Press, 2008)
Jeri Sedlar and Rick Miners, Don't Retire, REWIRE! (2nd edition), (Alpha, 2007)
Eric Sundstrom, Randy Burnham, and Michael Burnham, My Next Phase: The Personality-Based Guide to Your Best Retirement (Springboard Press, 2007)
Also in Print and Audio . . .
For more about the challenges and the richness of this phase of life, I would suggest these previous "Psychology of Advice" articles: "Retiring Minds," "The Age of Enlightenment," and "The Bell Tolls."
Finally, I can't praise highly enough a wonderful therapeutic resource for couples seeking to deepen their emotional connection: "Crossing the Bridge," a four-part CD set created by therapist and teacher Hedy Schleifer and her husband Yumi (www.hedyyumi.org).