I have a bone stock '92 that I putt around in from time to time, and every rubber component is original. Not that I'm proud of it, and I'd be lying if I said I don't have an assortment of hoses/clamps/fittings from previous engine partouts I've done lying in the trunk at all times, but I digress.
Point being, while not a prudent habit, the rubber components can be trusted for a long ass time, so long as there aren't any unnatural forces like abrasion acting on them. Silicone stuff probably lives forever, idk.
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