Aluminum Wiring was used in home construction from 196? To 1978. It has been since discovered that aluminum wiring is a fire hazard and wiring of this type must be repaired/ replaced. Aluminum corrodes when in contact with copper, so connections loosen, which can lead to arcing and fires.
Wiring before 1950 typically had rubber insulation which can become dried out. The brittle insulation can easily crack and even fall off exposing the conductor. Arching can then occur which is a serious fire hazard.
A lack of working GFCI outlets in wet areas (Kitchen, bathroom and outdoor areas) is another hazard but this is generally easy to fix. If the outlet has a true ground conduction, simply replacing the outlet with a GFCI outlet is all that is needed.
For outdoor fixtures if the lights flicker when it’s windy it is also a good indication the wiring to that fixture could be dried or frayed. This should be addressed asap as a situation like this could lead to arc-ing which is a fire hazard.
A lack of working GFCI outlets in wet areas (kitchens, bathrooms and outdoor areas) is another hazard but this is generally easy to fix. If the outlet has true ground conduction simply replacing the outlet with a GFCI outlet is all that is needed.