The Age Requirement for Medicare and What Happens Before 65

Medicare starts at age 65 for most people

You become may be able to access for Medicare on the first day of the month you turn 65, or the month after, depending on your birthday. If you turn 65 on the first of any month, coverage begins that day. If you turn 65 on any other day, coverage begins the first day of the following month.

This age threshold applies whether you are still working, retired, or self-employed. Your work status does not change when you can enroll. What matters is your age and, in some cases, how long you or your spouse paid Medicare taxes.

Medicare has four parts—A, B, C, and D—and they cover different things. Part A covers hospital stays. Part B covers doctor visits and outpatient care. Part C is an alternative way to get Parts A and B through a private insurer. Part D covers prescription drugs. You do not have to take all of them, but the age requirement applies to all parts.

Key Takeaways

You become may be able to access for Medicare the month you turn 65, regardless of whether you are still working.
You must enroll during your initial enrollment period, which runs from three months before you turn 65 through three months after, or you may face a permanent penalty on your premiums.
If you are still working and covered by your employer's health plan, you can delay Part B enrollment without penalty, but you must enroll in Part A.
Some people under 65 may be may be able to access for Medicare if they have been on Social Security disability for 24 months or have end-stage renal disease or ALS.

When you must enroll to avoid penalties

Your initial enrollment period is seven months long: it starts three months before the month you turn 65 and ends three months after. You should enroll during this window, even if you do not plan to use Medicare right away.

If you miss this window, you will pay a late enrollment penalty for the rest of your life. For Part B, the penalty is 10 percent of the standard premium for each full year you delayed. For Part D, the penalty is 1 percent of the national average premium for each month you went without coverage. These penalties are permanent and do not go away if you enroll later.

The one exception is if you are still covered by an active employer health plan when you turn 65. You can delay Part B enrollment without penalty as long as you are employed and covered by that plan. You must still enroll in Part A, but Part B can wait. When you leave that job or lose the coverage, you have eight months to enroll in Part B without penalty.

How to enroll in Medicare at 65

You can enroll online at Medicare.gov, by phone at 1-800-MEDICARE, or in person at your local Social Security office. You will need your Social Security number, proof of citizenship or legal residency, and information about any current health coverage.

If you are already receiving Social Security benefits, Medicare will enroll you automatically in Parts A and B about three months before you turn 65. You will receive a notice in the mail. You do not have to do anything unless you want to decline Part B or choose a different plan.

If you are not yet receiving Social Security, you must enroll in Medicare yourself. Do this at least one month before your 65th birthday to make sure coverage starts on time. Enrolling late can delay your coverage start date.

People under 65 who may be may be able to access for Medicare

Age 65 is the standard threshold, but three groups of younger people can get Medicare. The first group is people who have been receiving Social Security Disability Insurance (SSDI) for 24 consecutive months. The second is people with end-stage renal disease (ESRD), which requires dialysis or a kidney transplant. The third is people with amyotrophic lateral sclerosis (ALS), also called Lou Gehrig's disease—they become may be able to access when ready without waiting.

If you fall into one of these categories, you will be enrolled automatically or notified by Social Security about how to enroll. You do not need to wait until 65 to start coverage.

Coverage options once you turn 65

Once you are may be able to access, you choose between two paths. The first is Original Medicare, which is Part A plus Part B. You pay a monthly premium for Part B, a deductible when you use hospital or doctor services, and coinsurance (a percentage of costs). You can see any doctor or hospital that accepts Medicare.

The second path is Medicare Advantage, also called Part C. This is a private insurance plan that covers everything Part A and Part B cover, usually with lower out-of-pocket costs but a narrower network of doctors and hospitals. Most Medicare Advantage plans include Part D (prescription drug coverage) automatically.

If you choose Original Medicare, you must enroll in Part D separately if you want prescription drug coverage. You can do this during your initial enrollment period or during the annual open enrollment period in the fall.

What to do before you turn 65

Start thinking about Medicare enrollment about three months before your 65th birthday. Review your current health coverage and any prescriptions you take. If you are still working, check whether your employer plan will continue after you turn 65 or whether you will need to switch.

Visit Medicare.gov and use the Plan Finder tool to compare Original Medicare and Medicare Advantage options in your area. This tool shows you which doctors and hospitals are in each plan's network and what your costs would be. You can also call 1-800-MEDICARE to speak with someone who can walk you through your options.

If you have questions about how Medicare works with your current coverage, ask your employer's benefits department or your current health insurance company. They can tell you whether you need to make changes when you turn 65.

Frequently Asked Questions

What happens if I turn 65 while still working?

You can still enroll in Medicare. If your employer offers health coverage and you are enrolled in it, you can delay Part B without penalty, but you must enroll in Part A. Once you leave that job or lose the coverage, you have eight months to enroll in Part B without a late penalty.

Can I delay Medicare enrollment if I have other insurance?

It depends on the type of insurance. If you have employer coverage through your job or your spouse's job, you can delay Part B. If you have individual insurance or coverage from a spouse's retirement plan, you should enroll in Medicare at 65 to avoid penalties. Call 1-800-MEDICARE to confirm your situation.

Do I have to enroll in all four parts of Medicare?

No. Part A is automatic if you are receiving Social Security. You can decline Part B if you have other coverage. Part C and Part D are optional. However, if you decline Part D when you first become may be able to access and enroll later, you will pay a permanent penalty unless you had other creditable drug coverage.

What if I miss my initial enrollment period?

You can still enroll during the general enrollment period from January 1 to March 31 each year, but you will pay a late penalty on Part B and possibly Part D for the rest of your life. The penalty is permanent even if you enroll later. If you have a good reason for missing the important date, contact Social Security to ask about an exception.

Does Medicare cover everything once I turn 65?

Medicare covers many health services, but not all. It does not cover dental, vision, hearing aids, or long-term care. You may want to buy a supplemental plan (called Medigap) to cover costs that Original Medicare does not pay. Medicare Advantage plans may cover some of these services, but coverage varies by plan.

This guide is for general information only and is not medical, financial, legal, or other professional advice. For decisions specific to your situation, consult a qualified professional. See our Editorial Policy.