If you're referring to the ilk of Jon Benet Ramsey and the myriad of kiddie beauty pageants, you're right. However, as for the matter of older, post-pubescent adult-sized youngsters, I'll refer you to the Final Examination, posted here in FR that I'm sure SOMEONE will provide the URL to, that all graduates of secondary education were expected to pass at age 13 back around the turn of the 20th century in this country. Compare that with what the educators now call "an elementary education" in TODAY'S schools.
We used to let our young grow up at their own paces. Today, we force everyone to grow up at the pace of the slowest - and then stupidly call ALL of them "children."
Just another example of dumbing-down.
Michael