How do Tripels hold up over time?

Tripels, as well as any highly alcoholic and/or highly hopped beer, will store and age well over time. Most beers will become sweeter with time. Your Tripels, Impy Stouts, Old Ales, Barleywines, etc all age pretty well.

 

for the most part barrel-aged beers don't age as well as their counterparts, with a few exceptions.

 

Tripels are a beer that hold up well for some time, but don't really improve. Meaning, I'd have no problem drinking a 2-3 year old tripel, but I'd never expect it to actually taste better than it did fresh.

They're usually sweet to begin with, but the occasional hot one might be worth a wee bit of time to take the edge off. Otherwise, there's little point to actively aging most tripels IMO.

I'll echo Shogo on the aging of barrel-aged beers, particular for more delicate styles like a tripel. Hold with confidence for a tasting or whatever, but don't lay it down for years...

 

Based on my experience, they generally lose their finer nuances as you age them. Most tripels are higher ABV beers (8+ %) and will hold up for a period of 6 months - 1 year, but for my money, I prefer to drink them fresh, unlike say, a quadrupel which usually develops more complexity over time.