Lets see, what attributes do those taking part in this event have:
A body
Two arms
Two legs
A head
A torso
No significant health issues
The ability to ride a bicycle
Supreme fitness as applied to the passtime of cycling.
You have all of those attributes already, except perhaps the last. If you do not poseess the last then there is no reason that you could not acquire it by effort and dilligence.
If you fancy a crack, do it. Don't enter into it lightly, do take time to research it and even more time to prepare, but whatever you do don't end up a sad old fart who could've done loads of great things but never got around to it. You only get one crack at this life.