In his treatise on Metaphysics, Aristotle, a pioneer in the studying life expectancy and demography more generally, pointed out that the whole is greater than the sum of its parts. This idea also applies to Population Europe, the network of Europe’s leading demographic research centres: In joining forces, the partner institutes are able to address a much broader regional and thematic scope in their policy dialogue activities, publications and other outreach materials than a single institute could do alone.