Medicare research has shown that there are substantial disparities by race and socioeconomic status in use of services. In this article, I review past research and discuss how findings apply specifically to vulnerable men aged 65 years or older. Six lessons from this review are identified and illustrated here. Disparities in certain measures of health are growing; to reverse this trend, substantial efforts are needed, including dissemination of information about disparities as well as testing of hypotheses regarding underlying causes.