Also: Many entrepreneurs do not pay themselves for a year or so to allow their businesses to gain traction.
Considering that most businesses fail within 5 years, I'm not enthusiastic about the older-than-55 crowd starting their own business. If you are fresh out of college you may be able to set up a company - you have time you put your finances back together, should the effort fail, but as a retiree you are looking at old-age poverty.