Cognitive impairment has emerged as a major driver of disability in old age, with profound effects on individual well-being and decision making at older ages. In the light of policies aimed at postponing retirement ages, an important question is whether continued labour supply helps to maintain high levels of cognition at older ages. We use data of older men from the US Health and Retirement Study to estimate the effect of continued labour market participation at older ages on later-life cognition. As retirement itself is likely to depend on cognitive functioning and may thus be endogenous, we use offers of early retirement windows as instruments for retirement in econometric models for later-life cognitive functioning. These offers of early retirement are legally required to be nondiscriminatory and thus, inter alia, unrelated to cognitive functioning. At the same time, these offers of early retirement options are significant predictors of retirement. Although the simple ordinary least squares estimates show a negative relationship between retirement duration and various measures of cognitive functioning, instrumental variable estimates suggest that these associations may not be causal effects. Specifically, we find no clear relationship between retirement duration and later-life cognition for white-collar workers and, if anything, a positive relationship for blue-collar workers.

We examine the role of health as a determinant of labour force participation, paying particular attention to the link between the two provided by disability insurance schemes. We first review the evidence on associations between health and labour force participation. Enrolment in disability insurance is not determined by health alone, and we highlight the main other causes that the literature has identified. In an application to The Netherlands, we follow the structure of the literature review and show that the trends in health and disability insurance enrolment look rather positive. In particular, the 1990 reforms of disability insurance might have been more effective than previously realised because part of their success was hidden by demo- Health, disability and work: patterns for the working age population 147 graphic change: The large number of baby boomers kept the absolute inflow high as they aged, despite large reductions in relative rates.

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