teenagers age 15 and older, though.]]> date.]]> stop the problems that many gender stereotypes cause.]]> people think girls should look and act.]]> mind by age 10.]]> role.]]> cause problems.]]> late to make a big difference, the study says.]]> behave.]]> strong and tough.]]> unhappy.]]> expected to play with dolls.]]> fixed in a child's mind by age 10.]]> beginning to accept girls who want to dress or act like boys.]]> difference, the study says.]]>