This background paper discusses the potential impact of ageing societies on the labour markets in G20 countries. It provides an overview of key questions raised in the context of a longer working life and policy options which can support a multistage life approach. It begins with a review of the evidence about longer working lives and changing working patterns as well as and how societies, labour markets and institutions react and support these shifts. The paper then turns to policy principles and options for a multistage life approach, focusing on examples from G20 countries.