One of the oldest bitcoin exchanges that is still around today operating successfully is The Rock Trading. Based in Malta, The Rock Trading launched in June 2011 after being a virtual business in Second Life. After the fall of virtual worlds, mainly due to their centralized economies, it evolved into a full featured bitcoin exchange. In a recent interview with FinTechStage as part of an exhibition at the Milan 2016 conference, The Rock Trading talked about their roots and secret to their success.
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http://bitcoinx.io/news/articles/the-rock-tradings-history-and-secret-to-success-plus-an-update-on-campbx/