because you touch yourself at night....and why the hell arer you on here, shouldn't you be out getting drunk and drinking beer from the chests of women, young 'uns these days eh....
Because the calendar is stuck on 06 if you register in 2006 or later and your birthday in 2006 was before you registered on the forum then it won't recognize it.
User CP - edit profile - date of birth
Check that the details are correct and its set to Display age and full date of birth.
Cant see any other options related to Birthdays, so I guess thats it.