I was initially hesitant to reveal my birthday, as I feared that one of my various online accounts' sole security question was "What is your birthday?" After some thought, I could not think of any, which suggests that even if it were an issue, any such account would probably not be that important.
Since I am only 20, I sort of feel like this day in the shadow of next year (not to mention in the shadow of those who are turning 21). I have had a number of conversations like this:

Friend: Happy Birthday!
Me: Thanks.
Friend: So, are you 20 or 21?
Me [sighing]: 20.
Friend [disappointment apparent, as visions of a wild and crazy birthday party disappear]: Oh. You're young!
Happily, my iPod did arrive today, as you can see from the picture on the right. <wholesome>And unlike alcohol consumption, listening to music is legal at any age!</wholesome>
Happy birthday anyway! I'll probably never get used to the fact that legal drinking age in the US 21 and legal driving age is 16. Here it's more like the other way round.
But don't be disappointed, once you're nearly in the mid-twenties (like me :/) you will wish you were 18 again. ;)
Enjoy your iPod!
Happy birthday! Hope all exams go well.
Speaking of birthday-based security…I hear that FASCS allows professors to change their passwords over the phone and uses their birthdays as authentication.