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Yeast isnt so much the worry, its the extract and grains. Ive brewed with LME's that have sat on the shelf for a year or so and it leads to a very unpleasant cardboard taste and thats the nice way to describe it.
That's old. Its' ingredients are toast for a drinkable beer. Yeast is dead for sure. Hops will have nothing to offer either. But the extract you can still make use of for yeast starters, just crash and decant the beer off. But still wouldn't be as good as using fresh DME. The hardware should be fine, just check the plastics for cracks etc.
17 year old dried yeast? Which costs maybe $5 new? And is the most critical factor in the production of beer? (Brewers make wort, yeast make beer). Replace it.
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