it's not only you. everybody who is under 13 and gets caught is banned. and the 6 months are a compromise because I don't know whether you turn 13 tomorrow or in 11 months.
and fyi, COPPA is a law that states that people have to be 13 or older in order to give out personal information without parental consent. and let me quote the rules here: Smogon enforces COPPA. If you admit to being under the age of thirteen, you will be banned until you become thirteen years old.
should be clear enough.