This is the third version of Porterhouse Celebration Stout to feature on the blog, having already done the original 10% ABV one (twice!) and the 7% ABV regular one, now no longer in production. This is the Kilbeggan barrel-aged special that appeared briefly in the winter of 2011/12 and I don't think has been around since.
I was impressed by this when first tasted, admiring the big whiskey flavours and decadent chocolate richness, and also noticed that it was tricky getting a head to form. 12+ years later the head is a lost cause, fizzing away quickly to nothing on pouring. The aroma is fairly minimal, offering token custard-like vanilla but not much spirituous warmth. Thankfully the chocolate is still there in the flavour, and it hasn't picked up any nasty oxidation, which is always a worry with these pull-tab Porterhouse stoppers. There's whiskey too: I had thought it more bourbon-like when fresh, but age has mellowed it into the smooth and honeyish Irish whiskey I expected originally. There's no richness, however. The main thing that age has done to this is thin it out.
I can't say it has gained any extra complexity. It certainly doesn't taste like something that's been matured for over a decade. It's still very good, however, retaining much of what made it great in the first place. I'm glad this isn't my last bottle.