My husband has what appears to be about 46 oz. of what I am guessing is liquid malt extract in a cabinet above our built in microwave. I know we brought it from our old house when we moved to our present house just over 20 years ago. I want to throw it out. I can't imagine it is any good at this age. Could it possibly be okay?
So, you're talking about 10 times the recommended shelf life. I'd toss it.