It really depends how the person who owned the boat took care of it.....
Like.. engine... I run barnacle buster through the engine once a year,, for 24 hours. It completely cleans out any salt/sea creature deposits. I do the same for the HVAC every two years.
The deck... as long as it is kept washed and polished with a deck treatment it should withstand any salt destruction. The main thing after a sail that they washed the boat down.
I saw more electrolysis damage setting in a fresh water marina than I have ever seen in a saltwater marina...
And the bottom.... My bottom is clean longer in saltwater than it ever was setting in a lake. Seems like the sludge and mud loved the bottom in fresh water. When I haul the boat down in the Gulf we do a power wash and light sanding then paint.
That's my take on it.... having my boat in both fresh and salt water.
BUT to comment on 40 year old rigging.... I would replace it if it was salt or fresh water anyway. especially forward and back stay,,, have side stays thoroughly inspected.
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