Cantillon Gueuze or Geuze is a blend of lambic aged for three years, two years, and one year. The base is a three year old lambic and then the brewer blends in two and one year old lambic to get the taste he is looking for. This beer is a good candidate to cellar in a cool, dark place for years. I have some aging try an older one in a few years. Cantillon is working on a project currently (started in 2012) with the city of Brussels to have a cellar where they age Gueuze for years (+30 years) so that you could try different vintages at the brewery.
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