Isn't it funny how differently people handle this one? I love birthdays and I don't mind one bit if someone starts a birthday thread for me or if they know how old I am. OLD!!!! I always try to respond to the ones that are posted if I have some sort of relationship with the person who is celebrating. I am bad about looking to see who is having a birthday, though.

Another reason that I have always left mine in my profile is in case someone doesn't know me well enough and wonders what age person I am. Sometimes you just want to know. But I do not fault anyone for not having their birthday or at least the year on there.