I agree to most of kris's answer, however I don't think appraisers look at it that way, for example; Sugar house values are insane and it has really old homes that have original wiring, plumbing, foundation and everything else except charm, flooring and paint. So I think that value still comes down to the saying of Location, location, location and asethetics.
Age is always a concern but it depends if its an old home in a newer neighborhood. Or a newer home in the old area. Which follows location location location. I do think the Eff as referenced below may just state on the tax records when the last time thier was a permit pulled on the home, for example; a garage could have been added to the property in 2005 and the home was still built in 1920. In this case there are two dates on the tax records however its a good rule of thumb to throw out that second date and go by the original date. Thanks James