It is, but in the reverse factor, I mean the normal factor, that which is stating the common sense fact that the more experienced you are the more you can do difficult things (including putting yourself in the shoes of young immature people)

It seems crazy that just for 2 examples of youngster having been promoted on the front page of magazines suddenly everyone seem to think only young people can do that.

As far as I can tell, and in fact I don;t care that much, Steve Jobs was not very young, neither is Jeff Bezos. The founder on the web company where I work is look young, but not that young, I'd guess over his forties.

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.