Marc Nadeau is one of the most reputable and competent appraisers I know. He's done great work for me in the past and in properties that were daunting to appraise. When I read his recent article: Demographic shifts and the impact on real estate values - by Marc Nadeau I felt the need to share his perspective. They sound, articulated in anyone grasp. 

So if you're seller or buyer you need to read this.