Answer:
seems like mine haven't even start growing yet! and i'm 16!
anyway, they won't grow anymore when you reach the age of 18-20. So don't be worried, chances are that they won't stop now. ;)
Well yea you are only 14 you still have 4 years to go until you are 18 and maybe they will stop growing at the age of 25 or something. Unless you get some fake ones then they will no longer grow. Or just ask a doctor.