Why?
After all - if there is a relationship between age or condition, why doesn't FNMA not even mention age?
I miss the old Boeckh appraisal system. It classified houses by age from pre-war and post war for one. I can presume that a house (here at least) wasn't even insulated prior to the energy crisis of 1972-3. In fact, FHA didn't even require those little cookie cutters to have insulation until later. In 73ish, some FHA houses had higher utility bills than mortgage payments and as a consequence entire subdivisions of them went into foreclosure.
So this house, was built in its day as top shelf housing. And it has features no modern house of similar size (1,000 SF or so) has. Large pillars, wood trim, wood subfloor, wood flooring, 9' walls. The quality is almost always established by the COST and we don't know the original cost. But I bet if you did a comparison of appraisals you would find a correlation between the QUALITY RATING and the CONDITION RATING... a QUALITY house in poor CONDITION, will get downgraded from its actual QUALITY. Condition and quality should be separate items.
This house from a cost book rating has a substantially higher RCN than does most newer houses of its size. But even those don't account for insulation, nor plaster over sheetrock (plaster is more expensive but perhaps not superior although commonly though of as superior materials)