The research project addresses three main questions: Who are the persons that continue to work after “normal” retirement age? What are their motivations? What are the consequences for the individual and for society? To answer these questions we perform an analysis of external and internal factors affecting the choice to stay after 65 years on the labour market or to leave earlier. Among external factors we investigate are: The impact of the prevailing labour laws and regulations on senior citizens’ participation on the labour market ; The socio-economic factors that affect the likelihood to stay on the labour market after the age of 65 ; The impact of employers’ human resource strategies on the possibility for senior workers to remain on the labour market after the age of 65 years. We also analyse the the role of individ specific factors such as motivation and , personal traits but the outcome in terms of subjective well-being and health.