The World Population Ageing 2013 report is the fourth in a series. The first report was released in 2002 in conjunction with the Second World Assembly on Ageing. The present report, which updates the 2007 and 2009 editions, provides a description of global trends in population ageing and includes new features on the socio-economic and health aspects of ageing. This report is accompanied by an interactive database on the Profiles of Ageing 2013.