Which Birthday Is The Dreaded Number? [POLL]

I just had a birthday yesterday and it was awesome. I'm fortunate to be doing something I love and I got to spend my day with the people I love, so which birthday it is didn't really matter to me. Later in the day, though, a conversation broke out in the office about age.

I know men and women are different about this, but that didn't really matter. It seemed everybody had their own idea of which age was the "dreaded age". Obviously it varied based on how old the person you asked actually is, but it was interesting.

So I wanted to turn the question over to you. Take the poll, and tell us what you think.