My house is 60 years old (completed in 1959) and the wiring in this place is fine - overdone if anything (#12 copper wire run literally everywhere!). What fell far short was the switches and outlets. They were mostly original and made by a company called Slater. Let me just say that they are CRAP. I had quite a few plugs so loose that things wouldn't stay plugged in and switches that wouldn't stay on or off unless you jiggled them just right.

A couple years ago I repainted the house and decided to replace the outlets and switches while I was at it. It was a horror show - melted and burnt wiring in over 50% of the outlet boxes due to the crappy connections internal to the plugs, one had been on fire at some point! Had I known what was lurking behind the faceplates, I wouldn't have slept in this house - SERIOUSLY! Every single switch, outlet, box, and light fixture in this place got replaced - even the doorbell wiring. The main wiring and electric panel were all fine!