In the United States, Medicare is a single-payer, national social insurance program that through private insurance companies, provides health insurance for Americans 65 and older who've paid the payroll tax when working. It covers, on average, about half of their health costs. With the Medicare population doubling in the next 30 years, how should we pay for seniors' health care needs in the future (e.g. higher taxes, lower spending)?
Suggested reading: https://www.cnbc.com/2015/07/30/how-to-pay-for-the-future-of-medicare.html