I presume that you are not eligible for Medicare for some reason. You might investigate individual health insurance though with the open enrollment season having concluded on February 15th you would have to have a “Change of Life Status” event occur or qualify under the provisions of the upcoming special election period beginning March 15th (this is for people who were uninsured in 2014 and have just figured out they are going to have to pay the individual mandate tax penalty and that they would be subject to the individual tax mandate penalty for the 2015 tax year). If you were to qualify you would have to be prepared to pay a pretty high monthly premium.
If you have a business or have a spouse that has a business and some employees you might consider a group health plan. I recently wrote a small group where a man about your age had emigrated from Europe because he had married an American lady about 20 years younger than him and they had a small business with a couple of other employees. that man is now covered as his spouse’s dependent under their small group plan.