GIRLS are starting puberty earlier and as a result are more likely to become aggressive teenagers, Queensland researchers have found. The study found that at 14, girls were also just as likely as boys to be involved in fights, threats and stealing – reinforcing the perception that young women are behaving more like their male friends. University of Queensland sociologist Jake Najman, lead author of the research, said children were experiencing puberty at earlier ages because of increasing rates of obesity. He said while early puberty for girls was related to an increased risk of aggression in adolescence, the same...