Older adults living with HIV/AIDS require a complex array of services. Such needs can be addressed both by the service network developed for HIV as well as the network developed for older persons. This study of adults, age 50 and over with HIV/AIDS (N = 41), compared the knowledge and use of services commonly available from the HIV network as well as the aging network. The study sample had similar knowledge of HIV services and services designed for older adults. These individuals, however, used a significantly higher number of services provided through the HIV network (mean of 2.61 services) compared to the aging network (mean of .68 services). Predictors for service use varied across systems. While the primary predictor of HIV service use was awareness, Medicaid eligibility and living arrangements were predictive of use of services from the aging network.