What age is appropriate for LEGO Technic sets?

LEGO labels most current Technic sets 8+, 9+, or 10+, and that lines up with what verified-purchase reviewers report. Smaller sets like the Off-Road Race Buggy (42164) and Bush Plane (42198) are commonly cited as good first Technic builds for kids around 8–10. Larger supercars like the Bugatti Chiron (42083) are 18+ and clearly aimed at adult builders — reddit threads on r/legotechnic regularly describe 30+ hour build times for that one.