Yeah, I was worried I had aluminum wire, but my electrician assured me it's not. My house is about 60 years old. I got a new breaker box several years ago when I put solar on the roof.Scary
My house was built in 1971.
It was kind of horrifying to see how many of the original electrical outlets and switches had dangerously failed or where about to fail.
I also upgraded my fuse panel to circuit breakers.
(But that was required by my insurance company)
I had those old glass screw in fuses.
The only good thing was all of the wiring is solid copper wire.