Medicaid is best described as a program that is:

Explanation

Medicaid is a joint federal-state program that provides health coverage to low-income individuals and families based on financial need (limited income and assets), with the federal government and states sharing the cost. It is not purely federal or age-based (that description fits Medicare), is not premium-funded by recipients, and is not open to everyone regardless of income, because it is means-tested. Medicaid is also the largest payer for long-term custodial care in the United States, a gap Medicare largely leaves uncovered.