Yup. Been there done that. I quit work at the end of 1994 at age 50. Haven't worked a day since. With a good plan, anyone can do it in 15-20 years. Always pay yourself first...it's about capital and preserving it..
That takes a very high income, along with thrift, or selling a successful business. I can bag it all now, but choose not to, but it took about 25 years of working to get there, with what I am comfortable with as critical mass. These days, I don't see how folks without very high incomes, will ever get there in some parts of California.