Risk for Schufa score due to (threatened) Commerzbank termination

Hi everyone, I have the following question: My oldest checking account is with Commerzbank. They've been annoying me for years now, asking me to agree to their new terms and conditions (including an account management fee of €5 per month, I think it's hacking!). I've been able to ignore it so far and so far without any consequences. Actually, I would be willing to simply change the account. However, I have now heard that the age of the oldest checking account has an influence on the Schufa score, meaning that the Schufa score will never get worse