What age range do these robotics kits target?

It varies widely. Sphero Indi is marketed for ages 4+ with screenless coding, Ozobot Evo for 5+, and mBot, Sphero Mini and Sphero Bolt for 8+. Arduino-based kits like the ELEGOO UNO R3 car and LEGO Mindstorms EV3 sets skew toward 10+ and motivated tweens because they involve more assembly and text-based logic.