On the whole, the less developed regions of the world still have young populations, a situation that is unlikely to change much before 2020, when ageing will become a more significant factor. Some of the larger emerging economies, however, are likely to be converging with OECD population-ageing profiles by mid-century. Projections for 2050 indicate that the share of those over 65 is heading for around 25% in the People’s Republic of China (hereafter “China”) and 23% in Brazil and the Russian Federation, closely follow'ed by Argentina, Colombia and Indonesia with 18-19% (UN, 2011).