Fiscal sustainability and demographic change : a micro approach for 27 EU countries / Mathias Dolls (ZEW and IZA), Karina Doorley (LISER), Alari Paulus (ISER, University of Essex), Hilmar Schneider (LISER and IZA), Sebastian Siegloch (University of Mannheim and IZA), Eric Sommer (IZA and University of Cologne). Bonn : IZA, 2015