Average Age of Successful Entrepreneurs?

Is there a correlation between age and success?

Vivek asks this question at the startup forum

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Of late (precisely past 10 months) I have come across many successful entrepreneurs across various industries and many of them were well backed by investors (not to say funding = success), one thing I found common among them was their age or amount of experience before they jumped on the startup wagon. Most (about 80%) of them were in their 33+ in age. Did not see many young folks (exceptions would be ofcourse redbus, directi etc) in their 20s.
Here comes the question now. Is there a direct co relation between the probability of success and the # years of experience. Are you more likely to have more folks joining you(clients, investors etc) if you are older. Is there learning for youngsters that sometimes its good to wait and explore more?

Do share your perspective at the forum.