With the growing aging population, addressing the well-being of the elderly in China has become increasingly urgent. Mobility challenges due to physical decline often lead to psychological issues, highlighting the need for improved transportation solutions. Advanced Driver Assistance Systems (ADAS) offer new opportunities for enhancing mobility among elderly drivers. However, little is known about elderly drivers’ acceptance of ADAS, their preferences for specific features, and their expectations from ADAS. To address this research gap, we conducted focus group interviews with 21 participants, divided into four groups based on age and prior ADAS experience. The findings reveal that participants in general held positive attitudes toward ADAS, with older adults showing more favorable perceptions compared to younger participants. Elderly adults also preferred auditory interfaces, while younger participants had no specific preferences. Additionally, younger participants tended to favor warning-oriented features, whereas elderly drivers preferred features that can actively assist drivers in handling critical situations. These findings provide valuable insights for defining more precise user groups and offer design guidelines for future ADAS systems, which can support automakers to design more inclusive ADAS.