If, on the other hand, you share a cheap apartment, have parents or a partner who can support you, and are willing to skip the expensive vacation, you might get pretty far with little money.
I think that's the reason why so many startups are started by people just out of college -- they're used to a modest lifestyle, and they usually don't have a problem being dependent on someone.
It's amazing how quickly people think it's impossible to live on less money after a few years of having a regular job.