sort of standard
It depends on how the boat was used. If used for racing you probably would replace the standing rigging after 7 to 10 years, if cruising perhaps 10 to 12 years. Apart from the fact that a surveyor wants to protect his backside, you may find that insurance companies will make problems in case of a claim, if standing rigging wasn't replaced. It is very difficult to visually inspect standing rigging, because the real damage that can occur happens inside: the typical issue is for the inner strands of the S/S to loose their strength due to combination of salt and lack of oxygen(I understand it is not really the same as corrosion), Consequently you don't see anything, but the rigging can just snap.It happens mostly in the swages at the turnbuckles, where salt water accumulates and then seeps in between the strands of wire.An experienced rigger may be able to find tell-tale signs, and recently there seems to be an electronic/ultrasound way of detecting inner strand problems.(only saw an ad about it - probably a very expensive test).Having said that, some boats happily sail for 20 years without ever having replaced the rigging. But if you sail 'under load' such as choppy seas, more than 20/30knts wind etc, you would like to stay on the safe side.In my area 10 years is used by insurance companies as 'sort of' standard. In case of rigging failure they will cover only a percentage (if your rigging was replaced 5 years ago, they will cover 50%)and if rigging is more than 10 years old chances are they'll make a hell of a lot of problems about consequential damage.