Next Generation was just epically bad at writing kids. I don't know if it's cause they were constrained by social norms at the time, "We need more Beaver Cleavers and less Bart Simpsons" syndrome. Their emotions had nothing in common with the emotions of real human children.
Children of the 1500s had just as much in common with those from the stone age too. Or from the 1900s for a rather less melodramatic parallel. Either way, TNG wasn't going to show kids being no different several centuries later to ours.