That's exactly the main thing. They are an old car now. They are only "hard" to maintain because of their age and parts now getting worn and needing replacing. No harder than any other car of the same age however.
Also comes down to what you are like. My car is expensive to maintain because I use expensive tyres, expensive fuel, expensive brake pads, expensive oils, expensive car care products, regular servicing etc.
If I didn't give a crap about that it would be just as cheap as any other car.