MM.... useless in the sense it wont apply to every kid. Secondly, the parents dont have to become over intrusive just cos the kid crossed the age as suggested by the study. And lastly, a caring parent irrespective would know when the kid crosses that mark and needs to be educated. If so many kids lived thus far and lived nicely under the guidance of their parents I dont see how this study is going to make any difference other than some dollars of the sponsors down the drain to keep the stomach of some uselss people filled or increasing their bank balance.