Maybe I'll brew that really big crazy beer for my second kid (if one comes)! But I'm pretty well decided on an 8.5% ABV English Strong Ale for this one. I may up the IBUs a bit, but I'm not sure. I kind of like the idea of a beer that tastes great from the start, not one that is over-bittered and boozy for several years. Maybe that's a mistake, but we'll just have to wait (21 years!) and see. I actually think a moderate-alcohol beer might start slightly ahead of the curve, since the yeast will be much happier than if they had to deal with crazy high sugar and alcohol content. Whatever.
I've actually been reading a lot lately about beer stability and it seems like it's not a very well understood subject. It's actually kind of hard to make anything of the info out there. Firstly, everything seems to be aimed at commercial breweries attempting to maintain their product on the shelf for up to a year - nothing like what I'll be aiming for with a beer that will be cellared for 2 decades. Secondly, much of the information is contradictory. Maillard products are said to both help and hurt. Antioxidants like ascorbic acid (Vitamin C) are said to both help and hurt. The story is the same for different hop compounds, cold break, etc. I think my best course of action will be to do what I can to minimize oxygen exposure throughout the whole process, and to keep everything as "clean" as possible. Not sterilization-wise only, but being sure to get the runnings really clear into the kettle, keep all the cold break out of the fermenter, use really fresh and healthy yeast, etc. That should do the trick.
By the way all this talk and research about aging beers made me pull out one of my several years old westy 12 clones. Very nice!