There are signs to look for if your electrical outlet is no longer safe to use. Cords should not fall out of the outlet and the outlet should not move when you are plugging or unplugging electrical appliances. Electrical outlets should never be warm or hot to the touch.
GFCIs should be installed in any area that could be exposed to water. Bathrooms, kitchens, basements and garages should always have GFCIs. ALL outdoor outlets should be GFCI outlets.
You should have routine annual wiring inspections by a qualified electrician and always have your home evaluated after the removal of pests or following any weather or fire damages. The age of your home should be considered, but should not be a determining factor in deciding to re-wire.