"much more mature than the past"
They are more experienced in what they've seen watching 4 - 6 hours of TV per day, beiing saturated with media, magazines, etc for their entire young lives. But experientially, emotionally, they mature very little by watching TV, which is vicarious, inauthentic living.
The entire corporate marketing effort, The Great American Dream Machine, is geared to making you feel bad about yourself, to feel inferior, uncool, left out, old, "Left Behind", unsexy, unfashionable, sick!, unhealthy, sub-"par" skin/hair/ /boobs/butt, fat, sinful, so you are motivated by insufficiency to buy their , exercise machines, Green Prosperity Hankerchiefs, pills and drugs for everything ("ask you doctor" about our -with-side-effects for your imagined disease), consume our alcohol/junk "food"/cigarettes, use our cosmetics, drive our vehicles, "Christ" needs your money, etc, ad nauseam.
The marketing of sexiness to children is just corporate greed going after children's purchasing power and influence. They don't give a what harm it causes, just give us your money. The worse the girls feel, the more money for the corps. And of course if sex-oriented consumerism s the girls up, the doctors are there to drain your wallets to try to get the girls back to "normal".