To have an Uber account and be able to request rides, a rider has to be at least 18 years of age. Anyone under that age must be accompanied by an adult 18 years of age or older on all rides.
As a driver, you should decline the ride request if you believe the person requesting the ride is under 18. When picking up riders, if you feel they are underage, you may request they provide a valid drivers license or ID card for confirmation. Please do not start the trip, or allow a rider to ride if they are underage.