[It depends on how, and how watertightly, it has been stored. Old beer is not necessarily good beer, but it can last a long time if unaffected by the outside world.]
Kerith can't manage to suppress a grin as he tries to 'shush' Oren. "Quiet! Goblins!", he whispers as loudly as he can, before threatening to explode with twitters of laughter.
Upon return to the caskets, Kerith is more interested in liquid than in liqueur, and thus opts for a small bowl of the ale.
"Go easy, now. How do we know this isn't a trap where the goblins get us drunk and then skewer us?"