My house has to be at least 100. It's just one hack job piled on top another. I've rebuilding the inside of this house slowly for 25 years. Everything's great except the service panel in the basement looks like something you'd see in India. I'm embarrassed to even call an electrician.
The old farm house I rented for years, 1903, was like that. Electricity was added at some point and thank goodness they were afraid of it. All the original was put in metal conduit. By the time I got there the insulation on the wires would turn to dust if you touched them.