A study is reported in which accident rate is related to age and occupation. Ago distributions of observed accidents occurring during a four-year period to manual workers in each of nine jobs are compared with distributions expected on the assumption that job differences do not result in differences in fluctuations with age of accident rates. Three significant differences between observed and expected distributions arc obtained. These relate to the jobs of Electrician, Miller and Grinder, all of which are jobs in which mainly younger workers are normally employed. The median ages of those employed in nine jobs arc correlated with the extents to which accidents in the upper age groups are more or less numerous than expected. This correlation is significant, and indicates that older workers in jobs normally occupying younger workers tend to have more accidents than expected. Fluctuations in accident rates with ago are concluded as being a function of the type of work studied. The results of the study are thought to reflect the difficulties of older workers in meeting the demands of certain types of work.