The SAGE model will be used in order to ‘assess the impact of different social policy options on the future demand for pensions, health and personal social services, and long term care’ (Evandrou et al. 2001: 1). At the heart of this assessment lies the simulation of lifecourse trajectories for the British population from the year 2000 to the year 2020 and beyond. The simulations will require an understanding of differences across subgroups of the population in the labour market experience, in the demographic composition of their families, in the economic and social resources accumulated for the old age, and in health, disability and the needs for the personal care in old age.