Women mature intellectually earlier than men because they don't study Torah

 Torah Temimah (Bereishis 02:22.48) If you investigate the matter it seems that both understandings are correct. In other words the female has greater understanding and commonsense than the male and the intellect matures earlier. This is expressed by Rashi (Kesubos 50a) where he explains why girls start fasting at the age of 12 while boys wait until the age of 13 because girls develop intellectually earlier because they aren’t weakened by Torah study. That is because if the body is strengthened that also means the mind is strengthened.