Hello!
> Many of my friends' kids seem to be maturing very young. I also noticed that
> many girls these days as young as 11 or 12 have giant feet.
>
Girls are also reaching puberty at a lot earlier age -- sometimes as early as 7 years instead of the usual 17 at the turn of the century.
Juvenile delinquency has been co-related to early menses in a large longitudinal study in New Zealand.