Is it true that by getting old address removed from your credit your score will go up? If so how do I start?
No, this is not correct, in and of itself. Removing old addresses does help in the dispute process, as the addresses listed are used as one of the main "identifying tools". If the personal information cannot be matched, then often the CRAs delete the tradeline. So, removing old addresses will not help your credit score, but it will help improve your chances of successful disputes, hence raising your credit score.
Just one less data field. Target incorrect names and SSN's along with telephone numbers and employers.