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Forty-four million US licensed drivers are ≥65 years old and at higher crash risk. Decision-making about stopping or continuing driving is difficult and often involves family and friends. This study examines if decision conflict about changing driving habits is associated between older adult drivers and their study partners (SPs) (i.e., family member or friend). Data were from a multi-site trial assessing a driving decision aid. Decision conflict about stopping or continuing driving for drivers and their SPs were measured with the Decision Conflict Scale (DCS). Dyadic associations between drivers’ and SPs’ DCS scores pre- and post-decision aid implementation were analyzed using an actor-partner interdependence model. Among 228 driver-SP dyads, driver mean (SD) age was 77.1 (5.1) years; 50.0% female; 98.7% non-Hispanic; 94.7% white; and 97.8% urban-dwelling. SPs mean age was 66.1 years (13.9); 65.8 …