To actually answer your question Jip...Yes, and no.
Things like wisky and vodka etc will last for years and years, IF its kept sealed.
Wine obviously lasts if its sealed.
Beer on the other hand should only really be kept for 6 months tops. That's why Casey's mouth taste like he licked the dogs arse! :lolcry:
Think of it this way, the more alcohol content it has, the more of a preservative effect it will have, and the longer it will last. :P