I still do, even at age 29. My mom always made a big deal out of my birthday (and I'm an only child); there was always family coming over, my mom always got me great presents and cake even though we were poor.
Into my teens and up to now, I have stopped celebrating my birthday elaborately. Some years I don't celebrate at all, other years it's just a small gathering with my relatives. But even when I don't celebrate, I get excited about my birthday. Last year, I had no opportunity to celebrate my 28th, so I just bought a couple boxes of chocolates and handed them out to my co-workers, just so I could have a bit of a birthday feeling.
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clarity of thought before rashness of action