Boys and girls in the
USA are hitting puberty almost 2 years younger than they did in the
1970s! Obesity and estrogen-mimicking chemicals are two of the main
causes. Though long-term medical effects are of concern, perhaps even
more significant is the fact that the brain still matures at the same
old rate and life experience accumulates only so fast. This means that
pre-teens are feeling impulses and urges earlier and enduring the
consequences of risky behaviors longer.