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The average age of the World Service listener is 32 years old, according to the latest audience research – Rajan Datar finds out about the profile of the audience, how the total audience figure has increased, and why radio listening numbers have fallen. He also hears about the growing importance of digital services and the increased numbers for the Russian internet service. Plus, the producer of a series of debates about World War One, which start this weekend on the World Service, tells us about the relevance of the subject for todays audiences.