not sure what you're talking about... But when it asks me for a birthday... I ignore it. Just put the correct password in and it lets me log in! Has anyone else actually tried this?
Junior wasn't completely wrong. If you accidentally mistype your password, it'll request your birthdate along with your password. If you get it right the second time, there's no need for the birthday. However, if you haven't visited your account in a long time, you'll need the birthdate regardless of password correctness. And there's no new way to get past the birthday thing since the mobile phone thing.
I highly doubt there is another way to get your birthdate unless you develop a cracker (which could take years to guess)
Neopets Mobile was patched months ago. If you have any other accounts that are NFs with your old account, though, just check every couple days for the age to change.