Not all houses will require a full rewire. It may have been upgraded at some point. The first place to look is the fuseboard. If it has pull-out fuses then this may be a sign of the electrical installation being dated.
It will be worth getting in contact with local electrician to carry out a safety inspection. This willl check the current electrical installation via visual and electrical tests. A professional judgement can then be made on the state of the electrical install.
