Judging by the photos, they probably were babied and weren’t used very much. This might sound silly, but the best way to make washers and dryers last forever is to have a extensive wardrobe of clothes to the point where you can go for weeks if not a month before having to do any laundry at all. And when it is time to do laundry, there will be a good few loads of laundry to do but if that’s once a month, can’t really complain. The original owner probably went to the laundromat to wash stuff to help reduce the wear and tear off of the machines.