At the moment, you are not eligible for Medicare until the age of 65. However, there are some circumstances that can allow you to be eligible for Medicare at 55.
If you have been eligible for Social Security or Railroad Retirement Board (RRB) retirement benefits for at least 24 months prior to age 65, you can start receiving Medicare benefits at age 55.
If you have a disability, you may be able to receive Medicare at age 55 or older. You must have received Social Security disability benefits or SSI for at least 24 months or have a qualified disability in order to qualify for Medicare.
If you have End-Stage Renal Disease (ESRD), you can qualify for Medicare at any age (not just 55). You may qualify for Medicare if you need dialysis treatments or a transplant, are eligible to receive Social Security or Railroad Retirement Board (RRB) benefits, and meet certain other conditions.
If you qualify for any of the above situations, you can apply for Medicare at 55. To determine if you are eligible, contact your local Social Security office or visit their website.
For more detailed information, you can review this article from the Social Security Administration: