Well, I guess the answer's in there, but only if you already know about pipe tobacco. Doh!

Captain Black's an aromatic, so it won't age much at all in airtight conditions. In a pouch, which is far from airtight, it will dry out like crazy after probably 3-6 months. With that many years, it should be crackly. Once it gets that dry, it'll never taste like a fresh pouch. You can smoke it still, though. It might not taste good, but it's not dangerous. Best ways to rehydrate are to spray it lightly with distilled water, leave it in a humidor (optical humidity for pipe tobacco is about 30%) or pack it and then breathe gently into the pipe.

So ashauler, have I answered the question sufficiently now?