It would be ideal to get those gifted kids before they spend 5-6 years in the 'real world' with all the "Baby Shark," Roblox, and various other brainrot, but if you pick kids randomly from a very early age, most of them will probably not be all that gifted. Though I suppose maybe you could rely on genetic heritage (parents of very high IQ) and/or just do a large number of them and just assume you'll luck into enough geniuses to be worth your while.