Drivers license question?

I got my permit when I turned sixteen, I got my first drivers license 10/11/2007 it is a Junior license, it says that it expires 02/18/2011, but the license center told me that it would no longer be junior, and would turn into an unrestricted license when I turn eighteen, which is in four days, so do I just go down to the center when I turn eighteen to get my new picture taken, or do I have to keep this junior until 2011, that would make me 21, I was told that you are allowed an unrestricted license in the state of Pa only when you are eighteen.
Please let me know what I should do, Im very confused.
Thanks.
I know that you are supposed to keep the license four years, but it doesn't seem to make sense that is Im an adult at age eighteen my license would say junior on it, the Dmv didn't send me a letter in the mail yet though.