Most Helpful Girl
I'm not sure if this is part of it, but in the womb, males brains go through a "testosterone wash". Girls go through an "estrogen wash". Studies show that in the first few months of life, girls are doing certain things at a 400% higher rate then boys.
I think it's just how hormones effect our bodies. Physically speaking, females tend to develop faster than males... but I think there is a difference between being physically & mentally mature vs emotionally mature.
Although girls might be more mentally mature, I think BOTH girls and boys are emotionally immature until their 30's.1