What age should a kid start on a 2-wheel scooter instead of a 3-wheel?

Across the reviewers we read, most kids transition to two wheels between ages 5 and 8, once they can balance a bike or pedal confidently. Three-wheel lean-to-steer designs are widely recommended for ages 2-5 because the wider base teaches steering before balance, while older kids quickly outgrow them in both stability and speed.