Population ageing - a growth in the proportion of a population that is in older age - is now occurring in every region and nearly every country of the world. Indeed, the growth of older populations is among the important global phenomena of the twenty-first century. It poses both opportunities and challenges for societies and policy makers, but these are far from uniform worldwide. Dynamic factors are at work impacting on how ageing will influence people, places and policies and there are large variations in the rate and timing of population ageing across countries, owing to differing social,...