New driving licences

Yesterdy we tried to get Daves driving licences renewed for the next 5 years. We rode to Petchaburi (about 30 minutes) thinking it was going to be easy, just return he temporary ones and get them replaced with permanent ones. HA. We were told we had to get forms from the immigration office in Hua Hin, about an hours ride from where we were. Off we go (bums going numb now). Arrived there to be told it would cost about £12.00 BUT he also needed a medical examination and letter to say he was fit to drive. Ok paid the money rode back to Cha-am, another 30 minutes of bum numbing agony. We then went to a doctors surgery and of course couldnt get past the receptionist. But success for a price she gave him a letter certifying him fit to drive, no medical nothing. Today is a national holiday (about the 4th this month) so tomorrow we will ride to Petchaburi again (bums permitting). What I would like to know is how 7 year olds get a driving licence for a motorbike, some of them cant see over the handlebars?