It is impossible to know of course, but it is probably fair to say that if they had been born dirt poor they would have been much less likely to have the kind if incredible success that they did have

People like to say that success is right time, right place, but that's not all there is to it. You also need sufficient resources to take advantage of opportunity

Sitting on a gold mine does not matter if you don't have a shovel

Having a shovel doesn't matter if you don't know where to dig

And you need to have enough time ('runway' in startup speak) to actually try digging for gold in the first place