Most programs are for teenagers age 15 and older, though. Girls are not supposed to ask a boy for a date. There are programs that try to stop the problems that many gender stereotypes cause. There are set roles for how people think girls should look and act. These roles are fixed in a child's mind by age 10. Some children do not stick to their gender role. A new study says these gender stereotypes can cause problems. By then it is too late to make a big difference, the study says. Gender stereotypes are ideas about how girls and boys should look and behave. People want boys to be strong and tough. That can make them very unhappy. Girls are expected to play with dolls. These roles are fixed in a child's mind by age 10. They are beginning to accept girls who want to dress or act like boys. By then it is too late to make a big difference, the study says.