Keep in mind that Gore-tex fabric is sewn in between the outer and inner materials of most clothing. It has no effect on the outer or inner materials. Meaning...that the outer and inner layers are not waterproof as a result of the Gore-tex. It sounds like the water repellent outer layer simply needs a re-treatment. I've used Nikwax spray to rejuvenate the outer layer's water repellancy, it's good stuff and will have your outer layer repelling water like new again if treated properly. As to Gore-tex's life span, I'm not sure. But I believe it should be good to go unless it's integrity is broken down, ie. it becomes ripped or holes are poked through it, etc.
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