I don't know that many people, so I don't know anyone who retired really early.
I don't know if this is along the same lines but most of the people I know who are doing well in life had parents that helped them.
They had their college education paid for, they could always work part time at the family business, or if their career plans failed they could work at the family business and get paid more than any of the non-family member employees. They get a house or apartment, car, insurance, phone paid for by the family, etc. A big part seemed to be they could try all sorts of things (study abroad, pastry chef, mountain guide, landlord, artist, etc) when those didn't work out they could work at the family business.
Edited to add... these people will probably have an inheritance at some point.
This isn't always the case but the rest of the successful people took much longer to get there. They might be doing well but now it's with student loans, a mortgage, and no retirement savings.