One thing has changed....Kids not playing outside as much....I know this for a fact.
The Apartments where I grew up in, were always full of kids...We use to know kids from other apartments and use to have water gun fights, and do a bunch of shit.
Fast forward 20 years later....Same exact neighborhood demographic with poor immigrants(illegal and legal), and with a bunch of kids(I know because they have too much kid birthday parties)....Rarely do I see kids outside...and when I do, it's usually kids in the same apartment complex, and they mostly play with their own bros.
Seems like kids are just busy all day inside and the neighborhood seems to have lost a sense of community atleast with the kids...don't get me wrong, I grew up in the 90s, and we loved video games,tv,etc but we also loved being outside...Today's kid seem to love being inside more with all the shit they can do.
Now the positive thing about this.....Seems like gangster can't go outside and recruit kids or create impressions on them, which is what they use to do back in the day when I was growing up.
As for what OP is saying...I don't think kids are physically or mentally weaker, but then again I don't really talk to kids so idk...but like everybody has said, the older generation has always compalined about the newer generation...
Having said that...90 kids > 2000 kids, and it aint even close.