I think the best founders are those that have (1) experience and (2) are still hungry.
Zack bypassed requirement #1 simply because it received enough funding to not worry about the first problem you have when starting a business (having revenue). He's also smart and probably picked up the required experience on his way.
On the other hand there are plenty of youngsters that fail because of a lack of experience, once confronted with the harsh realities of running a business, and there are also plenty of seniors that fail simply because they are not hungry enough, which limits their creativity.
Zack bypassed requirement #1 simply because it received enough funding to not worry about the first problem you have when starting a business (having revenue). He's also smart and probably picked up the required experience on his way.
On the other hand there are plenty of youngsters that fail because of a lack of experience, once confronted with the harsh realities of running a business, and there are also plenty of seniors that fail simply because they are not hungry enough, which limits their creativity.