I recently decided I'm going to start aging some of my favorite big commercial beers. That said, I'm not totally sure of the point other than having some good beers around if the apocalypse comes. The beers I'm putting aside are all malty ~10%ers (none hoppy of course), but they're all delicious now, so I'm curious as to how they'll improve or change. For those who buy beer to age, what is the biggest draw to doing so? What kinds of organoleptic changes should I expect from my humble stash? Any criteria other than ~10% ABV and malt-emphasized that I should keep in mind for squirreling-away beer?