I agree with the above comments/consensus; really old tobacco (especially the OTC aromatic blends) can withstand considerable storage, but eventually it loses the flavor and sparkle that made it what it was. As an example, I started smoking pipes in the mid-90s using shrink-wrapped pouches of Middleton’s Cherry my father had bought in the 70s. It was kept in a cool dark basement for 20 years. It didn’t feel overly dry, tasted great to me and anyone who cared to comment on it complimented the pleasant cherry aroma. I recently found some more of that same tobacco, but now at 50 years old, though still in shrink-wrap and foil, it felt crispy and had virtually no pouch note. I rehydrated it with cherry liquor (I could describe the process I used if anyone is really interested) and it’s a very nice, sweet cherry smelling smoke. As you can see from the photo below, my dad was a pack-rat so I have lots of tobacco cans to explore. But thanks to this thread and subsequent research I realized there are matches or clones currently made for a lot of the older OTC tobaccos that are no longer in business. Codger clones! A whole new tobacco niche to explore!