I still have 3 cans of Old Frothingslosh Pale Stale Ale, bearing the fetching pose of the lovely bathing beauty Miss Frothingslosh. They were pruchased ca. 1968, and are unopened. My only surprise is that they have not (yet) exploded although there is no visible deterioration (external) of the cans. It is difficult to imagine what may now be inside, but it could only be an improvement.
One can was opened, and sample tastes were taken by at least four persons, none of whom was capable of swallowing any of it. Two additional cans were taken by a disreputable relative of my exwife, on the pretense that he knew a collector who would want to pay me handsomely for the remaining cans. I suspect his "collector" gave him a buck apiece for the two he took, but I haven't seen him since (or maybe he tried to drink one of them, which would also explain not seeing him again).