Well, I suspect that if a 100 year old house even had wiring, it would have been tube-and-knob, and grounds would not have been installed. Fuses, not circuit breakers, too. If it had plumbing, it would have been lead pipes.
That being said, my parents had a house built in 1963. I was a high school freshman, and had taken a handful of shop classes so I was interested in the process. I’ve done enough work on all of my own houses that I can probably compare, and other than foundations (I’ve owned slab, basement and crawl-space on piers), the biggest difference I can see is pre-built trusses. Drain pipes are plastic, and water-supply lines are PEX a lot of the time, but electrical seems to have been unchanged, unlesss you get solar or some other local generation.