This is what it says in my profile page: Once your birthday has been entered, it cannot be changed. Please contact an administrator if it is incorrect.
If it's just the date or month of your DoB which is wrong, then you can elect merely to display age, as opposed to the detail. If it's the year, @Administrator or @CaptainWard would be able to change it.
Personally, I have elected not to reveal my age or DoB, as it's largely unimportant 99% of the time, and being a woman of a certain age,.......... you know how it goes.
As both Admin and Captain Ward have now been tagged, you probably don't need to tag them again. I hope you achieve your desired result without too much delay. I doubt it will be this evening though, being a weekend.