In most Western countries, macro-level actors realise there are major challenges ahead in dealing with an ageing society. Demographic developments will have large consequences for welfare state expenditures and will profoundly alter the composition and level of labour supply on the labour market. Although various measures to raise the participation levels of older workers have been suggested for a good length of time now, there is still only limited insight into how employers are behaving towards older workers. The aim of this dissertation is to improve our understanding of employers' attitudes and actions towards older workers.