16yr od bags for beans from pantry! I found about 10 bags of various beans from a trip to Costa Rica in 2004. Bags are dated 2004. None say they are roasted. Got them tour of Cafe Britt. We stopped grinding long ago.... What are the odds
A) this is dangerous to brew
B) tastes good enough to bother to grind and brew them?
Been in their original box in a dark pantry air-conditioned home
Raw green coffee has a shelf life of about one year. Roasted beans last from a few days up to a year depending on how packaged; ground coffee even less than that. (source)
Based on that, the probability of B is practically zero, so I wouldn't risk finding out about A! (Seriously though, if the beans are at all mouldy, don't use them.)