As mentioned earlier the age was 12-13 at one timne. and then lowered to 10 for those miricle matured kids. Not every kid is one of those. Coming from a farm background , driving at 8-10 was no biggy. a car was just a tractor with a cabin and quiet tires that went faster than 12 mph. in the driving world the farm kids were the equivlant miricle matured kids. i see no problems with an instructor's kids diving early as they are exposed to it on a daily basis. they have been learning on thier own for perhaps a couple of years and see no real mystery is diving. Hard lines are made for the whole in general. So as an instructor would i have my dhild be certifiable at 8 of 9. Yes i would. Would i push them to do it no. Would i tank themout divng YES would i give them a card before they met the industry standard NO. No more than i would ask the dmv to give my kid a vehicle driving card at 13. They can drive in the field all day long but not on the roads. Id say its a difference between a perental vs a professional call.