Happy Birthday!! By now, I'm sure you're done from running around the room in circles shouting in exhilaration: "It's my birthday!! It's my birthday!!" then sitting down exhausted and realizing just how 'old' you really are!! (j/k)
At the least, I am still young, but once I turn 21 in August, I bet I would take RR's advice to run around in my small apartment until I puff out of air and think that 21 is getting old too...Ah, wellll.....Happy Birthday to you!