How do I pick the right LEGO age range?

LEGO prints a minimum age on each box that reflects piece size and build complexity, not maturity. Reviewers we read treat the LEGO City line (ages 5+, e.g. the Fire Rescue Boat 60373) as a good fit for early elementary kids, Creator 3-in-1 (7+) as the sweet spot for 8–10 year olds, and Technic (8+ and up) as the step up for kids who want gears, suspension, and steering.