How long did it take you to do your first Century?

[Starfish]

This particular century excites me, just like the thought of running across the Golden Gate Bridge motivated me to train for the San Francisco Half Marathon.

There's the key, right there. If you are motivated, and if your goals are along the lines of having a great learning experience, or going farther than you ever have before, or whatever (as opposed to making your goal too performance specific for your first one), then you can have a great experience and hit your goals more or less regardless of the outcome.

Go for it!