Normally it's not the age that gets these units it the inactivity. Everything gets coated in a thin layer of dust which turns to dirt which turns to rust and then nothing works not because of the age but because it just doesn't get used. If it were me I would take them all apart clean them grease the wheel bearings adjust the shoes on them and then see what you got. Once you have them apart you might see some things that need replacing that would be the cheapest way to go. Also like donn0128 said long runs of wire cut down on the electricity try not to do that. Hope this helps and hope you have fun with our hobby.