How often should you change out light switches and sockets?

They don't need to be replaced on a schedule. Some switches and wall outlets will start to wear or break through use and should be replaced then. There is some maintenance though if you have aluminum wiring. Some houses were built using aluminum wiring instead of copper to save money and it was found that this was a bad idea. The aluminum can cause overheating. If you have aluminum wiring you should periodically check to make sure the connections are tight. If you have copper you don't really need to worry about it.
How often should you change out light switches and sockets?
when they go bad, which is when they start sparking
How often should you change out light switches and sockets?
If it ain't broke, don't fix it. Most of the switches and sockets I've replaced were for aesthetic reasons.
The most common reason for changing them is renovations or redecorating, not maintenance. However, receptacles get worn over time and don't hold the plug very well and switches get dirty and look ugly. Actual failure of the receptacle or switch is not all that common in comparison.

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