Mike,
I was thinking of you the other day when I took my son out for some sushi.

Still chowing down those rolls?
There is nothing wrong about what you and Don are saying, but I keep wondering - what's the point?
First, while it is easy to understand the Brinkley looks younger than she is - it loses something in the transation. That house is 200, but it could pass for 160.

Second, the only possible reason to use something like EA is that within the appraisal there are sales of equal age, in unequal condition, or sales of unequal age that are in equal condition. Otherwise, you can just rank sales by year built (er uh, actual age).
Third, reports that include subject's EA usually do not: 1) include the comps EA, and 2) do not use EA in an adjustment calculation.
Now, I don't mean to go off on rant here - but -sometimes I think what is missing is an appraisal book that include the principles of common sense - for example - that, given two explanations, the simpler one is usually better, etc. So rather than try to breathe life into every thing one finds in the AI text, the protocol should be first to ask do I really need this thing in the appraisal. Is it "necessary to produce credible results?"
I don't use EA and no one has ever asked me for it. So maybe you "old" guys who are effectively still young who do the teaching could incorporate into your chestnuts a little practical common sense (in this case Occam's Razor). Maybe you could point out that EA isn't necessary and leads to long, unresolved debates.