I dunno, state schools are still pretty cheap. My sister's tuition with room and board is $10k per year. If you are someone smart enough to be an entrepreneur in your late 30s, you should have a corporate job paying 150k+ and can save all 4 years worth in a matter of months with a bit of determination.
And health care, while expensive, isn't as big of a deal as most people make it out to be. Get a high deductible plan and a family of 4 can be insured for <$700/month. If you are starting a business in your late 30s you should have a lot of savings already. While annoying, this shouldn't stop you.