From time to time, some folks get all excited when they discover a fuse box, an FPE panel, K&T wiring, or, even, cloth-covereg romex (w/o a ground).

These are simply older materials. I do not consider them, of themselves, to be of any particular hazard (please- lets not go off on these tangents!). I do, however, recognize that things are seldom left unchanged for fifty years!

So- these are the sorts of very real hazards to look for, when examining an older house.
For this house, a lot of the dangers can be properly blamed upon the current occupant; yellow romex hasn't been around very long.