I've cellared barley wines for 18 months and longer, they get nothing but better and they are typically hop bombs as well. I've drank IPAs after cellaring 1 month, 3 months and 6 months and could not notice any difference except maybe slightly less aroma
Barleywines are meant to be aged.
http://imbibemagazine.com/Cellaring-Beer
Now that your cellar, fridge or closet is secured, the fun part is filling it. However, not every beer should age. Most are best as soon as they’re bottled, especially hop-forward pale ales and IPAs. Hops are most pungent and aromatic when fresh, and even a few months will dull their character. (For example, the label on Russian River’s amped-up IPA Pliny the Elder reads DOES NOT IMPROVE WITH AGE! HOPPY BEERS ARE NOT MEANT TO BE AGED!)
When selecting beers for aging, Sysak suggests following general guidelines. First, it’s beneficial if a beer is 8 percent or stronger, since an elevated alcohol profile will typically become smoother, mellower and more agreeable. Another rule of thumb is to select a darker, maltier beer, because the sweet, residual sugars tend to soften over time. Above all, ensure that the beer is bottle-conditioned, wherein live yeasts lurk inside the bottle.
“Though the yeast doesn’t continue to ferment, it helps the beer age,” explains Hair of the Dog’s Sprints, who always finishes his beers with fermenting yeast. “All of our bottle-conditioned beers are meant to age,” he says of creations such as “Dave,” an English-style barleywine brewed more than 15 years ago and boasting 29 percent ABV. “It’s so much better now than it ever was. That shows the patience it takes to hang on to a beer for an extended period of time.”
So which beer styles are worth the wait? Sysak recommends Belgian strong ales,
barleywines, imperial stouts and, bucking the high-alcohol guideline, sour Belgians, such as lambics and Flanders red ales. With aging beer, there are always exceptions to the rule, Sysak says. “I have Tripels, saisons and blonde ales that are 10 or 15 years old and beautiful.”