The word "childish" comes out too often when we see people behaving unlike their age. The fact is they are not necessarily immature.. Immaturity should only be judged according to the decisions and choices one make. They may act stupid, but if they are living their lives right, do you still call them immature/childish? :) The opposite is true, one can act like an adult yet, make decisions that are so childish and immature. Aiyah. You get the point. :)