i'm almost 19, and my right boob is a whole cup size bigger than my left one, and i know its typical for boobs to he assymetrical but i don't think a whole cup size is typical... like its to the point where i have to buy 36D bras instead of 36C or else i have major spilling-out on the right side. i hit puberty years ago so theres no reason for my boobs to grow so much now