No. To get a chepaer elderly health care, some American Health Insurance companies give a big discount if you are insured with them and accept to undergo medical treatment in Malaysia or Thailand.
A pensioner visa with Thai insurance would bring you nearly there.
Some, oldies that I know of, on pensioner visa, get a maid that comes some hours a day, about 10,000 THB a month . Live in, goes up to 30,000 THB a month.
Medical visa is for hospitals like Bumrungrad where the treatment allows even family members to cling on it, 6 months max. Mostly Arabs use that.
Marriage visa: if something tragic happens to your wife (sickness, motor bike accident) you have 72 hours to leave Thailand, leaving the children (if you have them) behing and come back on another visa.