Specifically for health insurance coverage:
What are ones options when going back to school full-time in their 30s?
Do schools provide any sort of coverage plans, if so are how do they compare to a standard company plans?
Can you have dependents ?
Are there discounts if you have to pay for any of them, while a full-time student?
A couple of additional options beyond the school's (possible) health care plan may be available to you in the event that your income will drop significantly when you become a student.
First, you may be eligible for subsidies on the ACA exchanges. Check your state's exchange or healthcare.gov as appropriate to your location.
Second, if your income as a student is extremely low, and you are in a state that provides it, you may be eligible for Medicaid. A friend's daughter did this halfway through grad school when she turned 26 and could no longer be covered on her parents' plans. It was a great temporary solution until she graduated and got a job with benefits.
While this may depend on the university/college type, health insurance is usually required for full-time students unless you can prove that you have other coverage.
For instance, see this page from the Ohio State University.
I would suspect that student health insurance will not be as good as many company-provided plans but may be cheaper since the overall health of the student population should be relatively good. Then again, maybe not. OSU's family coverage for student, spouse and 1 dependent is $9756 for two semesters. Summer adds another $2439. If you have department support as a graduate student, they may cover 85% of your health insurance fees.
A big university may have options for inexpensive care even if it's not covered by the insurance like if there's a dental or optometry program. There may be low-cost clinics.
Right now, your answer is probably too broad as the details will vary depending on the university.
