If no one, ON A FORUM ON THE INTERNET, wishes you a happy birthday, then too bad so sad. I've been apart of this community for years and haven't once got a thread about my birthday, and for some strange reason my life goes on.
All I'm saying, is if people care enough about you and your birthday, they'll shout out on IRC, send you an IM, or as I said PM you. It isn't necessary that every n00b with 100 posts gets acknowledged that it's their birthday by the entire community.