I pay no attention to IC birthdays, because I am lazy and I can't figure out how the calendar works in several of my characters' universe, anyway. (Star Wars, why so confusing?) As far as I can remember, none of mine have canonical birthdays.

My 21st birthday was a month ago! The original plan was to spend the day at graduation ceremonies, then a nice dinner, then going to a bar with my friends, but somehow, that turned into searching for a missing roommate, packing all of the stuff that nine roommates didn't take care of before they left, staying behind to pack while my friends went to a frat party, and then playing nurse to a roommate who over-imbibed at the party, til three in the morning.

*facepalm*