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 inspected.
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.
Regards,
Gord