If you can move out of your house with nothing and get into a better position than your parents within 12 years, one or more of the following must be true: your parents weren't very well off, you got very lucky, the system was stacked in such a way that it would be difficult to not succeed.
Of course, we're talking averages and not just anecdotes. Even in a ****** economy, there will be some outliers that end up succeeding despite all odds.
There are 20 year olds making 150K plus currently, and I can't speak to all situations, but the ones I know of fall into the following categories: Their parents set them up with a job (family business, family connections, etc.), they work up in the oil fields, they have specialized jobs and went to school for 8+ years and likely are carrying crippling amounts of debt (unless mom and dad paid their way), or got lucky. It's also important to note that 150K doesn't go as far as it did 15-20 years ago (housing costs; they have to buy into the market with condos costing $750k plus).
Most people in their 20s don't have it as good as their parents did, unless their parents are (or have) paying for them to have that lifestyle.