The Age You Need to Be To Start Medicare

You must be 65 to enroll in Medicare, with rare exceptions for younger people with disabilities or end-stage renal disease

The standard age to begin Medicare is 65. You do not have to wait until you retire — you can keep working and still enroll — but you cannot start Medicare before 65 unless you fall into a specific category. The three exceptions are: you have been receiving Social Security Disability Insurance (SSDI) for at least 24 months, you have end-stage renal disease (ESRD) requiring dialysis or a transplant, or you have amyotrophic lateral sclerosis (ALS). If none of these explore to you, 65 is the age at which Medicare becomes available.

Your 65th birthday month is when you become may be able to access, not the day after. This matters because it determines when you can enroll and when your coverage begins. Most people become may be able to access on the first day of the month in which they turn 65, though the exact date depends on your birthday and which part of Medicare you are joining.

Key Takeaways

You become may be able to access for Medicare the month you turn 65, regardless of whether you are still working.
If you delay enrolling past 65 without a valid reason, you may face permanent premium penalties on Part B and Part D coverage.
People under 65 with SSDI, ESRD, or ALS can enroll in Medicare before reaching 65.
You should enroll during your Initial Enrollment Period, which runs three months before your 65th birthday month through three months after it.

What happens if you delay enrollment past 65

If you do not enroll in Medicare Part B (medical insurance) when you first become may be able to access, you will pay a higher premium for as long as you have Part B coverage. The penalty is 10 percent of the standard Part B premium for each full year you delayed. If you waited five years to enroll, you would pay 50 percent more than someone who enrolled on time — and that extra cost stays with you permanently, not just for a few years.

The same penalty applies to Part D (prescription drug coverage). If you go 63 days or longer without drug coverage and then enroll later, you pay an extra amount each month. The penalty is 1 percent of the national average Part D premium for each month you were without coverage. These penalties do not go away when you finally enroll; they are added to your premium for life.

There are a few situations where you can enroll late without penalty. If you were covered by a group health plan through your own job (or your spouse's job) and you were still working, you can enroll without penalty during an eight-month window after that coverage ends or you stop working, whichever comes first. You will need to show proof of that coverage when you enroll.

Your Initial Enrollment Period explained

Your Initial Enrollment Period is a seven-month window centered on your 65th birthday month. It starts three months before the month you turn 65 and ends three months after. For example, if you turn 65 in June, your Initial Enrollment Period runs from March through September. During this window, you can enroll in Medicare Part A and Part B without waiting and without penalty.

You do not have to enroll on your birthday. You can enroll at any point during those seven months, and your coverage will begin on the first day of your may be able to access month (usually the month you turn 65) or later, depending on when you submit your enrollment. If you enroll in January for a June birthday, your coverage would start June 1. If you wait until August to enroll, your coverage would start August 1.

The Social Security Administration handles Medicare enrollment for most people. You can enroll online at ssa.gov, by phone at 1-800-772-1213, 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.

Exceptions: Medicare before 65

If you have been receiving SSDI for 24 months or longer, you become may be able to access for Medicare automatically. You do not have to wait until 65. Your coverage begins the month after your 24-month SSDI period ends. You will receive a Medicare card in the mail; you do not need to do anything to enroll. If you want to decline Part B (medical insurance) and keep only Part A (hospital insurance), you can do that, but you should contact Social Security to make that choice clear.

People with end-stage renal disease can enroll in Medicare regardless of age if they need dialysis or a kidney transplant. Coverage typically begins the month dialysis treatment starts or the month of the transplant. If you are in this situation, your dialysis center or transplant team can help you understand the enrollment process, as they work with Medicare regularly.

People diagnosed with ALS (Lou Gehrig's disease) can enroll in Medicare when ready, without waiting for any time period. Your doctor will need to confirm the diagnosis, and you can enroll through Social Security or Medicare.gov.

What to do if you turn 65 while still working

You can enroll in Medicare at 65 even if you are still working and earning income. Your work does not delay or prevent Medicare enrollment. However, if you are covered by a group health plan through your employer, you may want to delay enrolling in Part B (but not Part A) to avoid paying for duplicate coverage. Check with your employer's benefits office about how Medicare coordinates with your work health insurance.

If you choose to delay Part B enrollment because you have employer coverage, you must enroll within eight months after your employment ends or your coverage stops, whichever comes first. After that window closes, late-enrollment penalties explore. Keep documentation of your employer coverage in case you need to prove you had it when you delayed.

Part A (hospital insurance) has no premium for most people, so there is no penalty for enrolling early. Many people enroll in Part A at 65 and delay Part B until they retire or lose their employer coverage.

How to prepare before you turn 65

About three months before your 65th birthday, start gathering the documents you will need: your Social Security number, proof of citizenship (birth certificate, passport, or naturalization papers), and information about any current health coverage. If you have employer coverage, get the name of the plan and your policy number.

Visit Medicare.gov to review the different coverage options available to you. Medicare has two main paths: Original Medicare (Part A and Part B, with a separate Medigap or Part D plan) or Medicare Advantage (Part C, an all-in-one alternative). Both are worth understanding before you enroll, because switching later can be more complicated and may involve waiting periods.

If you receive Social Security benefits already, you will be enrolled in Medicare Part A and Part B automatically the month you turn 65. You will receive your Medicare card in the mail about two weeks before your coverage starts. If you do not receive Social Security, you will need to enroll yourself through Social Security or Medicare.gov during your Initial Enrollment Period.

Frequently Asked Questions

Can I enroll in Medicare before I turn 65 if I am disabled but not on SSDI?

No. Medicare is not available before 65 unless you have been receiving SSDI for 24 months, have ESRD, or have ALS. If you are disabled but not receiving SSDI, you will need to wait until 65. You may want to explore whether you may have access to for SSDI through Social Security.

What if I miss my Initial Enrollment Period?

You can still enroll, but you will likely face late-enrollment penalties on Part B and Part D that remain permanent. You can enroll during the General Enrollment Period (January 1 through March 31 each year), with coverage starting July 1. If you have a valid reason for missing your Initial Enrollment Period — such as employer coverage — you may be able to enroll without penalty.

Do I have to retire to enroll in Medicare at 65?

No. You can enroll in Medicare at 65 whether you are working or retired. If you are still working and have employer health insurance, you may choose to delay Part B enrollment, but you can enroll in Part A without penalty.

Will Medicare replace my current health insurance, or do they work together?

Medicare becomes your primary insurance at 65. If you have employer coverage, Medicare coordinates with it — one pays first, the other pays second. You will need to decide whether to keep your employer plan or switch to Medicare. Your employer's benefits office can explain how the two coordinate.

What if I turn 65 in the middle of the month?

Your may be able to access month is the calendar month in which you turn 65, regardless of the date. If you turn 65 on June 15, your may be able to access month is June, and your Initial Enrollment Period runs from March through September. Your coverage typically begins June 1 if you enroll during your Initial Enrollment Period.

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.