do I have to pay debt that has been charged off since 2007

Most likely not.  If the creditor has not yet filed suit against you and obtained a judgment, and you have not received a billing statement or made a payment to them in over 4 years, it is most likely beyond the statute of limitations for them to collect. However, if they DID obtain a judgment against you, then they can pursue you for collections via wage garnishment, asset liens, bank account seizure, etc.