I can't seem to get my beer to last that long. I think it is because I drink it!!!
I do have 1 bottle left from my 1st ever batch that I brewed back in October. I plan on cracking it on St Patrick's day.
I do have a batch of stout that went horribly wrong, but I have not dumped it yet, because it is gradually getting better. I checked the bottles last night, and it appears to still be active, since I now have a line around the inside of the neck where it appears that yeast have been eating up all the leftover sugars. I screwed up this brew by adding waaaay too much extract, and it has thus earned the name Mobil-1 Stout. I am going to let it keep going in the bottles and see what it is like at the 6 month mark.