Females develop both physically and mentally earlier than males do. For example; females start puberty at an earlier age than males, and females brains mature more quickly than male brains.
Girls have always developed earlier than boys - on average the onset of puberty happens between the age of 8 and 12 years in girls and between 9 and 14 years in boys.
Is there an evolutionary basis for this? Are there theories for why females mature earlier in life?