In the face of the substantial ageing of population expected to occur in OECD countries over coming decades, policies that boost labour-force participation attract considerable interest. There remain large cross-country divergences in participation rates that are largely accounted for by differences in participation of specific groups, in particular prime-age women, older workers and also youth. This suggests that policies targeting these groups could have important effects. The aim of this paper is to examine whether the potential impact of several policy reforms is able to attenuate or to offset the adverse trend in aggregate participation rates that would otherwise occur because of ageing population. It uses a simple dynamic modelling framework that generates longer-term projections of participation rates and labour supplies in OECD countries and alternative scenarios of policy reforms. The main outcome of this analysis is that the combined effect of possible reforms targeting ...