In August I brewed my very first batch ever, an Amber Ale from Brewer's Best (kit). Six weeks later, I opened up the first bottle and was astonished - it tasted pretty darned good!
Over the course of September and October I drank almost all the bottles, and had about 6 left coming into November.
This past weekend, I hadn't drank one in about 2 or 3 weeks, and so I cracked one open. I poured it into a glass, and it looked totally normal. Good head on it, no visible particles/"floaters", etc. But when I went to taste it, it was super strong (alcohol), and after a few sips I tossed it.
I opened a second one - same thing. A third one, same thing.
My theory is that the yeast have been fermenting inside my bottles this entire time, and that the brew's "sweet spot" (that is, where taste and alcohol content were perfectly balanced) or Golden Age was back in September and October. And that now we've past that Golden Age and there is simply too much alcohol in the bottles now to be enjoyable.
So I ask: Is my theory correct? If not, what the heck is going on? And if so, is there anything a homebrewer can do to correct it or prolong a bottled beer's "Golden Age"?