sierra nevada bigfoot ale '09-'13 vertical

July 4th I opened the '09-'13 Bigfoot Ales. I have enough left to do a few more and was thinking of expanding it to 10 years, eventually. I'm not sure it's worth it, though. Between the 5 years there is enough variation that I don't think it would gain all the much form the extra time. It did provide a very nice gradient of flavors.
Starting with  the '09 there were a lot of raisin and toffee flavors, with just a hint of hops still peeking through. Trying the '13 immediately after this was a shock, the piney hops heavily contrasted with the almost non existent hops of the '09. The '11 fell right in the middle and the '10 and '12 did the same. Nothing unexpected, just a great example of how a beer can change with time.
At the end there was about an inch left in each bottle, so we made a cuvée of them all. This was really fantastic. The malt forward properties of the older vintages really shone through, but was tempered by the fresh hops of the later years. It was a great experiment and I can't wait until the next one.