The Basic Age Rule for Medicare

You become may be able to access for Medicare at age 65, regardless of your work history or income. This is the standard entry point for most people. You do not have to be retired to sign up — you can still be working — but you must be a U.S. citizen or permanent resident who has lived in the country for at least five years.

The month you turn 65, you enter your Initial Enrollment Period, a seven-month window that starts three months before your birthday month and ends three months after. If you miss this window, you may face late enrollment penalties that stay on your account permanently, so the timing matters even if you do not plan to use Medicare right away.

Some people become may be able to access before 65 under specific circumstances: if you have received Social Security Disability Insurance (SSDI) for 24 months, or if you have End-Stage Renal Disease (ESRD) or Amyotrophic Lateral Sclerosis (ALS), you can enroll at any age. These are the only medical exceptions to the age 65 rule.

Key Takeaways

  • Medicare may be able to access begins at age 65 for U.S. citizens and permanent residents who have lived in the country for at least five years.
  • Your Initial Enrollment Period runs for seven months — three months before, the month of, and three months after you turn 65 — and missing it can result in permanent penalties.
  • If you are still working at 65 and have employer health coverage, you may be able to delay enrollment without penalty, but you must notify Medicare of your coverage status.
  • People under 65 can enroll if they have received SSDI for 24 months, have ESRD, or have been diagnosed with ALS.

What Happens If You Delay Enrollment Past 65

If you do not sign up during your Initial Enrollment Period and you do not have a valid reason to delay, you will pay a late enrollment penalty for the rest of your life. For Part B (medical insurance), the penalty is 10 percent of the standard premium for each full year you were may be able to access but not enrolled. For Part D (prescription drug coverage), the penalty is 1 percent of the national average premium per month of delay.

The exception is if you have creditable coverage — health insurance through a current employer or a spouse's employer that is at least as good as Medicare. If you have this coverage, you can delay Part B enrollment without penalty as long as you are still employed or your spouse is still employed. You must enroll within eight months of losing that coverage to avoid the penalty.

To prove you had creditable coverage, keep your insurance documents. When you do enroll, you will need to show that your previous plan was creditable, or Medicare will assume you owe the penalty.

Enrolling Before or After Your 65th Birthday

You can enroll up to three months before you turn 65. Many people do this to make sure their coverage starts on their birthday month. If you enroll in January and your birthday is in March, your coverage will begin March 1. If you wait until after your birthday, coverage typically starts the first of the month following your enrollment.

The Social Security Administration handles enrollment for most people. You can sign up online at ssa.gov, by phone at 1-800-772-1213, or in person at your local Social Security office. Medicare.gov also allows you to enroll directly through their site, and you can compare plans there before you choose.

If you are already receiving Social Security benefits when you turn 65, you will be enrolled in Part A and Part B automatically. You do not have to do anything unless you want to decline Part B or choose a different plan.

Special Enrollment Periods for People Over 65

If you missed your Initial Enrollment Period, you may still have a chance to enroll without penalty if you had a may have access to life event. These include losing employer coverage, moving out of your plan's service area, or having a family member's coverage end. You get a two-month window from the date your coverage ends to enroll in Medicare without penalty.

Immigration status changes also create a Special Enrollment Period. If you become a U.S. citizen or permanent resident after age 65, you have two years to enroll without penalty, even though you were not may be able to access before.

To use a Special Enrollment Period, you will need to provide proof of the may have access to event — a termination letter from your employer, a notice from your plan, or an immigration document. Have this ready before you contact Social Security or Medicare.

Medicare Parts and Age-Based Coverage

Part A (hospital insurance) and Part B (medical insurance) are the two main components you enroll in at 65. Part A covers inpatient hospital stays, skilled nursing facility care, and hospice. Part B covers doctor visits, outpatient care, and preventive services. Both have the same age requirement and enrollment important date.

Part D (prescription drug coverage) also has an age 65 enrollment important date, but it is separate from Part A and B. If you do not enroll in Part D when you first become may be able to access and you go without creditable drug coverage, you will pay a penalty when you do enroll. The penalty is 1 percent of the national average premium per month of delay, and it is permanent.

Part C (Medicare Advantage) is an alternative to Original Medicare that combines Parts A, B, and usually D through a private insurance company. You can enroll in Part C at 65 the same way you enroll in Original Medicare, and the same late enrollment penalties explore.

Age and Medicare Costs

Your age at enrollment does not change your premium for Part A — most people pay nothing if they or their spouse paid Medicare taxes for at least 10 years. Part B premiums, however, are based on your income from two years prior, not your age. If your income was high two years ago, you will pay more now, even at age 65.

Part D premiums vary by plan and region, not by age. The same plan costs the same whether you enroll at 65 or 75, but waiting past your Initial Enrollment Period adds the permanent late enrollment penalty to whatever plan you choose.

If you enroll late in Part B or Part D, the penalty applies from the month you should have enrolled, not from the month you actually do. This means the penalty can accumulate for years before you sign up.

Frequently Asked Questions

Can I delay Medicare if I am still working at 65?

Yes, if you have health coverage through your employer or your spouse's employer. You can delay Part B without penalty as long as you are employed and have creditable coverage. You must enroll within eight months of retiring or losing that coverage. Part A has no penalty for delay, but you should still enroll to avoid gaps in coverage.

What if I turn 65 outside the United States?

You can still enroll during your Initial Enrollment Period even if you are abroad. Contact Social Security by phone at 1-410-965-7005 (international number) or through the Social Security website. Your coverage will begin on your birthday month or the month after, depending on when you enroll.

Do I have to enroll in Part B if I have employer coverage?

No, you can delay Part B if your employer coverage is creditable. However, you must enroll within eight months of losing that coverage. If you wait longer, you will owe the late enrollment penalty for the rest of your life, even if you eventually enroll.

Can my spouse enroll at 65 if I am younger?

Yes. Each person becomes may be able to access at their own age 65, regardless of their spouse's age. Your spouse can enroll during their own Initial Enrollment Period without affecting your coverage or enrollment status.

What happens if I miss my Initial Enrollment Period by a few months?

You will owe a late enrollment penalty unless you had a may have access to life event or creditable coverage. The penalty is permanent and applies to Part B and Part D. You can still enroll after your period ends, but the penalty will follow you. Contact Social Security to discuss your situation and see if you may have access to for a Special Enrollment Period.