A cheap mains power switch from 30-40 years ago had no problem being cycled once or twice a day for 30-40 years without ever failing. This is not a binding constraint.
Or, if it's really 40 years old, "cheap" could be "really fat and expensive" today.
If you pick up an old "broken" power (audio) amp, the most likely reason for it to be broken is pots - switch - caps - FETs in that order.