Beyond that it seems rather meaningless to attribute success to privilege over a multitude of other factors. It helps, but it's not the main component. Indeed those with the most privilege tend not to do so well. Consider rich kids who turn into generally unsuccessful adults. Clogs to clogs in 3 generations. The opposite of success.
Meanwhile you have people like JayZ who started among the least privileged (relative to the country) becoming one of the most privileged.
As for Gates, he had the drive and interest to spend his time learning how to program and explore business while he was a kid. While most of his peers were likely using that time to watch TV or party. That's an essential difference and no amount of privilege is going to bridge that.