1 beer to cellar almost forever

Gueuze. Probably 3F, but Hannsens and Cantillon hold up too, I would assume Tilquin does as well. Beersel doesn't seem to but I've only had old ones once.

Outside of gueuze either a quad (Rochefort or Bernardus are all over the place) or an English Barleywine/Old Ale, like JW Lee's.

 

De Dolle might be an option. Oerbier, Stille Nacht, or the reserve versions.

 

Lambic is a great answer, if you like aged lambic. It changes less than many other styles, but well-aged old lambic really is sublime.

For a non-lambic answer, I absolutely second De Dolle, especially Stille Nacht. The new vintages have a great slow souring and seem to be following the path of the pre-2000 bottles, turning into a really sublime balance between sour and sweet. Other good options for aging in that timeframe include the better quads that stupac2 mentions, along with the J.W. Lee's harvest ale. I personally think that North Coast Old Stock will go the distance, though there aren't any 20-year old bottles yet... Bell's Third Coast Old Ale is another accessible American option. A few wildcards that I'm optimistic about are A. Le Coq (by Harvey & Sons), Upright Billy the Mountain, the barleywine/old ale vintages of Alesmith Decadence, and the Bruery anniversary beers.

 

Agreed with Gueuze. I'm going to cellar a couple Cantillon 100% Gueuze from this year if I get my hands on some more. I get married this year, I graduate medical school, etc. etc. so this will be a good year to remember.

 

I've not had any with serious age on them but Courage imperial stout and its predecessors are routinely opened with 20 or more years on them. Ditto with Thomas Hardys. I third the JW Lees recommendations. Rochefort 10 is a beer that barely changed in 2 years for me so I could see it lasting a while.

 

If your goal is to just hit the 20 year mark or more just grab a '94 or '95 Sam Adams Triple Bock. Though don't ever actually consume it on purpose.

 

No Thomas Hardy fans for the win on your deathbed?

 

It's great stuff, but you can't buy it anymore!

 

I guess I should buy my liquor store out of the stuff then.

 

I just graduated and will be paying back for about 20 years. Been thinking of saving a few beers for that one day when I've paid them off. Hopefully I don't end up with some oxidize mess.

 

I think Rochefort 10 goes downhill after 5ish years. Not that I've aged cases, but the couple I've had that old have been too old.

 

I haven't had any Hotd that old but the 2008 and 2009 Fred From the Wood I had recently were fantastic. The brewer claims that Adam and Fred will age for the long haul.

 

I had a six year old Adam a few years ago and it was delicious. I meant to hold on to one for a decade, but I think I accidentally sent it as an extra right around that ten year mark.

 

Sam Adams Utopia - I hope I can find one very soon!

 

I've had 7 year old Rochefort 10s that were pretty damn good. If that's downhill, I wanna be at the bottom.

 

No beer you can cellar forever. Even very old Cantillon/3F show oxidization and cardboard flavor. Especially the cork didn't hold that well and it's very hard to take all the crumbles out. I had the 05 Cantillon Gueuze last week and it's one of the best. I'd say 8-10 years are the best for gueuze.

 

I plan on some long term for old stock, 120, Wws and Bigfoot.

 

Hotd adam is a champ. I had an 03 bottle about 2 years ago, and it was superb. All tobacco and leather.