I've been thinking similar thoughts as these, as to why kids are becoming so much more mature at a younger age and such. Whether it is the hormones that are added to the livestock and poultry or something else, I've noticed a huge change in the size of heighth and develovement in young adults (ages 11-18).
It's really hard to narrow it down though since the general public "can't be bothered" with such concerns.
Just my opinion.