You automatically qualify and are enrolled when you reach age 65 as long as you meet the work requirement. Most people will meet these requirements if they have worked and paid into the system. You can also qualify if you receive Social Security Disability and are disabled for two years or more.
If you were married to a Medicare eligible spouse for at least 10 years, you may qualify for Medicare.
If you are widowed, and have not remarried, and you were married to your spouse at least 9 months before your spouse's death, you may be eligible for Medicare benefits under a spouse provision.
If you are widowed, and have not remarried, and you were married to your spouse at least 9 months before your spouse's death, you may be eligible for Medicare benefits under a spouse provision.