Stung by the phenomenal success of the "Harry Potter" books, some people like to preach about the infantilization of culture, and some critics worry that adults are wallowing in childhood.
A companion worry is that children are growing up too fast, becoming sexualized at too young an age. With some girls wearing makeup when they're barely past being toddlers, not to mention rising levels of teenage sex and pregnancy, this is an understandable worry.
For good or ill, however, these things are cultural and social aspects of our modern life.