I don't think that's actually possible...
And by the time that you do, I'll probably have given up this whole "computer" lark as a bad job so win-win!
So am I, by about 2 months.
However, I think my profile has my dob as 1 Jan 1900, so the stats may be somewhat skewed by centenarians.
We share a birthday!
Seriously, there should be an option to say "MYOB" on the date of birth thing.