Had my own company for the last 20 years. Don't make a lot of money, but with the kids gone and having their own families, I can keep working until I drop if I want to and can also take a day off if I want to fish.
Job satisfaction and the ability to control your own future are more important as you get older than making a lot of dosh. Being careful with your coin and planing for the furture will lead you to a reasonable position by the time you hit you 'fitifies' and you then see that is where life begins.
Cheers
John