Safety and function, not age
In California, a landlord does not automatically have to modernize old wiring just because it is old — but they do have to keep it safe and working. The legal test is safety and function, not age.
Under Civil Code Section 1941.1, the electrical system must be maintained in good working order. Older wiring that still operates safely can be legal. But if that wiring has become a hazard — overheating, sparking, unable to handle normal use, or causing shocks and repeated breaker trips — the landlord must repair or replace what is needed to make it safe again.
So the question is usually not "how old is it?" but "is it dangerous or failing?" Signs of trouble include warm outlets, burning smells, flickering lights, and breakers that will not stay on.
If old wiring in your home is showing these warning signs and your landlord will not act, you do not have to keep living with the risk. A free, confidential review can help you understand your options.
This is general information about California tenant rights, not legal advice. Every situation is different.