It depends
Hello,Contrary to popular belief, no one lit a fuse on your standing rigging when it was installed; its life is dependent on several variables, and I can see you are aware of at least some of them, specifically salinity and amount of use. To those I would add original quality of both wire and terminals; relative load, with shorter life from lighter rigging; quality of tune, with shorter life from too tight or too loose; climate, with hot places worse than cool; and the relative stiffness of the boat.So you could have another five or more years of safe life remaining in that gang, or you could be about to suffer a dismasting. Really.I would go down to Radio Shack and get one of their $10 microscopes. Best deal on the planet. Get familiar with it, look at some new rigging as a reference, then check out yours. Consider looking at my inspection video and/or the 'Rigger's Apprentice' for some training. At best, I'd recommend replacing the gang in fewer than five years. But it depends.Fair leads,Brion Toss