We estimate the magnitude of any direct effect of retirement on health. Since retirement is endogenous to heath, it is not possible to estimate this effect by comparing the health of individuals before and after they retire. As an alternative we use institutional features of the pension system in the United Kingdom that are exogenous to the individual to isolate exogenous variation in retirement behavior. Data used will include both vital statistics and survey data that include both “objective” physical measurements and respondent self- reports. We find no evidence of negative health effects of retirement and some evidence that there may be a positive effect, at least for men.