I've noticed this too. I think youngsters are much nicer than I used to be, but rather...worthy.
Even at age 7, dd was telling my Auntie not to smoke in the car, please. A glass of whisky and a fag were Auntie's only pleasures, poor dab.
Youngsters seem so wise, but somehow so old. They don't seem to want to rebel...perhaps they have too much, too young.
Thinking about it, I rebelled against the status quo; strict parenting, strict schooling, tough rules. So we smoked because we weren't allowed, bunked because it was against the rules, and got up to all sorts in the bushes with unsuitable boys because we feared the consequences. There was a sense of excitement about it all.
Maybe there's nothing to rebel against any more
.