code

[Unregistered-odessa]

As was said national code DOES NOT require removal of old wiring still in safe condition and to code at time of installation. This is due to some wiring being very difficult to change. Chandeliers between the first and second floor are bears as is wiring to front portry alcoves etc. That said you SHOULD replace all outlets. Worn outlets are the same as bad connections. And if you want the two wire circuits to be safer than modern 3 wire grounded ones run them off of GFI breakers. 90% of the time the ground lug is not used on 2 wire home electrical items. GFI is worlds safer than unused grounds.