Tommy Bengtsson Population ageing, the shift in age distribution towards older ages, is of immense global concern. It is taking place to a varying degree all over the world, more in Europe and some Asian countries, less on the African continent. The worldwide share of people aged 65 years and above is predicted to increase from 7. 5% in 2005 to 16. 1% in 2050 (UN 2007, p. 11). The corresponding ?gures for developed countries are 15. 5 and 26. 2% and...