This is outrageous. A child riding a scooter on a residential driveway during daylight hours is very unlikely to be causing unreasonable noise. Instead, this is normal life. People cannot expect to live in close quarters with others and see and hear nothing of them. I enjoy seeing and hearing the children of various neighbours riding their bikes and scooters on the path past our units.
Follow JT’s advice re ‘doing the numbers’. If you talk to your neighbours, you might find they have been told off for other imaginary infringements too.