The standard age to start Medicare is 65

Most people become may be able to access for Medicare on the first day of the month they turn 65. You do not have to wait until your birthday itself — if you turn 65 on any day of the month, your coverage begins on the first of that month. This applies whether you are still working or retired.

Medicare may be able to access at 65 is automatic if you have been a U.S. citizen or permanent resident for at least five years and have paid Medicare taxes for at least 10 years (40 quarters) through work. You do not need to do anything to "set up" this coverage — it happens on its own once you meet the age and work history requirements.

Key Takeaways

  • You can start Medicare at 65 if you have worked and paid Medicare taxes for at least 10 years total.
  • Some people with disabilities or end-stage renal disease can start Medicare before 65, usually after 24 months on Social Security Disability Insurance.
  • If you are still working at 65, you may not need to sign up for Part B right away, but missing the important date can cost you more later.
  • You must sign up for Medicare during your initial enrollment window, which runs from three months before to three months after the month you turn 65.
  • If you miss your enrollment window, you will pay a permanent penalty on your Part B and Part D premiums unless you have employer coverage.

You may may have access to before 65 if you have a disability

If you receive Social Security Disability Insurance (SSDI), you become may be able to access for Medicare after you have been on SSDI for 24 months. This means you could start Medicare in your 30s, 40s, or 50s depending on when your disability was approved. The 24-month waiting period starts from the month you first received a disability payment, not from the month you applied.

You do not need to do anything special to move from SSDI to Medicare — Social Security will notify you automatically when you reach 24 months. Your Medicare coverage will begin the month after your 24-month period ends. If you are unsure whether you have been on SSDI for 24 months, you can call Social Security at 1-800-772-1213 to confirm your exact start date.

End-stage renal disease and ALS create different rules

If you have end-stage renal disease (ESRD) — permanent kidney failure requiring dialysis or a transplant — you may start Medicare regardless of age. Coverage typically begins the month you start dialysis treatment or the month of your kidney transplant, whichever comes first. If you receive a pre-emptive transplant before needing dialysis, your coverage begins the month of the transplant.

People with amyotrophic lateral sclerosis (ALS) have a different pathway: you become may be able to access for Medicare when ready upon approval for Social Security Disability Insurance, without waiting the usual 24 months. This is a unique exception created specifically for ALS.

What happens if you are still working at 65

You can delay signing up for Medicare Part B (medical insurance) if you are still working and covered by your employer's health plan. This is called the special enrollment period. You have eight months after your employment ends or your employer coverage stops — whichever comes first — to sign up for Part B without penalty.

However, you should still sign up for Part A (hospital insurance) at 65 even if you are working, because it is free for most people and has no penalty for late enrollment. Part B is where the penalty applies: if you do not sign up during your initial enrollment window and do not have employer coverage, your Part B premium increases by 10 percent for each year you delay, and that increase is permanent.

Your enrollment window is seven months long

Your initial enrollment period runs for seven months: three months before the month you turn 65, the month you turn 65, and three months after. For example, if you turn 65 in June, your window opens March 1 and closes September 30. You can sign up online at Medicare.gov, by phone at 1-800-MEDICARE, or in person at your local Social Security office.

If you miss this window and do not have employer coverage or another may have access to reason, you will pay a late enrollment penalty on Part B and Part D (prescription drug coverage) for as long as you have Medicare. The penalty is calculated as a percentage of the standard premium and compounds each year you remain uninsured.

How to sign up when you are ready

You can sign up for Medicare online at Medicare.gov by creating an account and following the enrollment steps. The website will ask for your Social Security number, date of birth, and citizenship information. If you prefer to sign up by phone, call 1-800-MEDICARE (1-800-633-4227) and speak with a representative who can walk you through the process. TTY users can call 1-877-486-2048.

You can also visit your local Social Security office in person. Bring your Social Security card, proof of citizenship (passport, birth certificate, or naturalization papers), and proof of residency (utility bill or lease). If you are signing up based on disability rather than age, bring documentation of your SSDI approval or ESRD diagnosis.

What to know about Medicare Parts A, B, C, and D

Medicare has four parts, and the age rules differ slightly for each. Part A (hospital insurance) and Part B (medical insurance) are the foundation — most people sign up for both at 65. Part C (Medicare Advantage) is an alternative to Parts A and B offered by private insurers; you can enroll in Part C at 65 if you have Part A and Part B. Part D (prescription drug coverage) is optional but recommended; if you do not sign up when you turn 65 and later decide you need it, you will pay a penalty unless you have had other creditable drug coverage.

If you are under 65 and starting Medicare due to disability or ESRD, the same four parts are available to you. You will follow the same enrollment process and have access to the same coverage options as someone turning 65.

Frequently Asked Questions

Can I start Medicare before I turn 65 if I am retired?

No. Retirement alone does not lower the age to 65. You can start Medicare before 65 only if you receive Social Security Disability Insurance (SSDI), have end-stage renal disease, or have ALS. If you are retired but do not meet one of these conditions, you must wait until 65.

What if I was born on the first of the month — does my Medicare start earlier?

No. If you are born on the first of the month, your Medicare still begins on the first of the month you turn 65, the same as anyone else. The rule is that coverage starts on the first of the month in which you turn 65, regardless of the specific date within that month.

Do I lose Medicare if I go back to work after 65?

No. Once you are enrolled in Medicare at 65 or earlier, your coverage continues even if you return to work or earn income. You can work and have Medicare at the same time. However, if you are receiving Social Security retirement benefits, your benefits may be reduced if you earn above a certain amount before your full retirement age.

What if I am a non-citizen — can I still get Medicare at 65?

You must be a U.S. citizen or permanent resident (green card holder) for at least five years to be may be able to access for Medicare at 65. If you do not meet this requirement, you cannot start Medicare based on age alone. Some non-citizens with ESRD or disabilities may have other pathways; contact Social Security to discuss your specific situation.

If I miss my enrollment window, can I sign up later without a penalty?

You can sign up later, but you will face a permanent penalty on Part B and Part D premiums unless you have a may have access to reason for the delay, such as employer coverage or certain life events. The penalty is 10 percent per year for Part B and 1 percent per month for Part D, and it stays with you for life. It is important to enroll during your initial window to avoid this cost.