But older people might have the least risk if their kids are grown and don't need help, their own parents gone, and they have enough money saved not to worry about failing.
Thus over 50 could have less risk than 25 and under.
But of course, we know that these types of endeavors have the highest failure rates, of all the different kinds of new businesses that you can start. The shoot-for-the-sky businesses seem to appeal mostly to certain venture capitalists, who are looking for the occasional big payout. And that kind of venture firm doesn't really care about the fact that shoot-for-the-sky projects have a high failure rate, since a high failure rate is already part of the venture model. But if we are talking about the majority of successful businesses that get launched in the USA, then the average age of entrepreneurs is much older than the youthful image that gets much discussed on certain startup sites.