I noticed the birthday date is currently locked in profiles. Why is this the case? It seems like a pretty trivial bit of information to lock. I know there must be a reason, but currently it escapes me completely.
I do not know why this is locked, but I do know there's only one possibility to have it changed and that'll be: Once your birthday has been entered, it cannot be changed. Please contact an administrator if it is incorrect.
If you believe it bothers you that much not being able to change it then please head to the Suggestions section and suggest it in a new thread there.