Standard Seoul Bike rentals are usually for people aged 13 or older, but the separately introduced family pass allows eligible children under 13 to ride with parental supervision. Seoul City's official guide instructs a parent to open 'My Information → Family Registration Management' in the Ttareungi app, register a child's date of birth and verify the family relationship. Up to four eligible children in the same household can be registered. After buying a family pass, choose between the adult's pass and the child's family pass in the rental screen. The city guide listed a daily-only family pass at KRW 1,000 for one hour or KRW 2,000 for two hours, with over-time charges billed to the purchaser. Register the actual child rider correctly for insurance and incident records. A responsible adult should accompany children, ensure helmets are worn and walk the bikes at pedestrian crossings. Recheck availability, eligibility and identity verification in the latest 2026 app before relying on the service.