Mine is 44 yrs. old. When I bought it a few years ago, the original appliances were in and usable. I still have the original water heater, fresh water system, and the stove/vent hood. The bathroom fixtures are all original too.
I have a 1972 Security sitting in my driveway with all the original equipment.We use it mostly for hunting but everything works..Having said that,I have replaced hot refrigerators/water heaters/air conditioners/water pumps etc in other newer units that have failed for whatever reason at no particular age...
Refers scare me the most in used units because so many do not level there refrigerators properly.