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Published online by Cambridge University Press: 25 May 2016
The history of the Galaxy is encoded in the kinematic, chemical and age profiles of its various populations, and their inter-relationships. Of these, the age structure has proved to be the most problematic. The aim of the present paper is to discuss our understanding of the ages of the various components and to seek to understand the chronology of the system, highlighting along the way some of the unsolved problems.