For the standing rigging
to be in salt water
, the boat would need be inverted - in which case the rig life might be expected to exceed that of the crew.
(Sorry, I just couldn't resist)
Most riggers suggest that 10 years is the safe lifespan for standing rigging, after which time it should be replaced, or (at very east) technically
We sold a C&C29 with original rigging that was 16 years old - the last 9 years on salt water
. The rigging (wire & fittings) were in apparently excellent shape (no visible
degradation). The boat was never raced, so might be considered to have been “lightly” sailed (barring the occasional Hurricane
etc.) I would not have, yet, replaced anything, had we kept the boat - but we'd have been watching out for any signs of trouble.