In this paper for the National Bureau of Economic Research Conference Report we examine the link between retrospectively reported measures of childhood health and the prevalence of various major and minor diseases at older ages. Our analysis is based on comparable retrospective questionnaires placed in the Health and Retirement Study and the English Longitudinal Study of Ageing – nationally representative surveys of the age 50 plus population in America and England respectively. We show that the origins of poorer adult health among older Americans compared to the English trace right back into the childhood years – the American middle and old-age population report higher rates of specific childhood health conditions than their English counterparts. The transmission into poor health in mid life and older ages of these higher rates of childhood illnesses also appears to be higher in America compared to England. Both factors contribute to higher rates of adult illness in the United States compared to England although even in combination they do not explain the full extent of the country difference in late-life health outcomes.