Clinical preventive services (CPS) (e.g., colorectal cancer screening, immunizations) reduce rates of premature death and disability in older adults and support healthy aging. The use of evidence-based CPS is below Healthy People 2020 recommended levels, especially among racial and ethnic minority elderly. HAPPI aims to increase CPS use by adults ages 50 years and older and reduce disparities in underserved African American and Latino communities. Funded by the U.S. DHHS's National Prevention Partnership Awards program, HAPPI uses an evidence-based collaboration model to mobilize and foster linkages between community health centers, the county department of public health, the county and city departments of aging, community-based organizations (CBOs), and a multidisciplinary group of academics in Los Angeles County. Capacity assessment activities conducted with 5 community health centers include: establishing a baseline of CPS utilization rates; identifying and mapping community resources in the community health centers' catchment areas with potential to support efforts to increase CPS uptake; identifying barriers and facilitators to increasing CPS use through key informant interviews with clinic personnel. Findings from the capacity assessment informed the development and implementation of training curricula for participating clinics and community-based organizations invited to collaborate to apply for small grants and implement evidence-based programs to increase CPS use. Lessons learned from HAPPI will inform a broader audience of clinics, community leaders, aging services providers, public health agencies and policy makers who share a common interest in promoting the health of an aging population.