For some reason, the forum software doesn't allow users to change their DOB, or any option to enable it. Because of this, there was a huge number of requests for us to manually change people's date of births. Please be sure to select your correct DOB (or whatever you want it to say) when signing up, because I have advised the team to no longer process these requests. They are too much of a distraction for something that should be automated. In the meantime, adding an automated way for you to change your DOB is on the to-do list. Until a time where you can change it yourself without requiring an administrator to change it for you, no DOB changes will be processed. We'll post an announcement whenever this tool is developed. I don't have an ETA for this yet. For now, you'll have to stick with your undesired DOB or create a new account.