AARP health insurance has two different age answers depending on what you mean. You can join AARP at 18, but the health plans AARP endorses are almost all Medicare products, which means the practical enrollment age is 65 for most people. If you qualify for Medicare earlier through disability, ALS, or end-stage renal disease, you can access AARP-branded Medicare Advantage and Part D plans sooner. Medigap access before 65 depends on your state.
Membership Age Is Not the Same as Plan Eligibility
A common misconception is that you have to be 50 to join AARP. Membership is actually open to anyone 18 or older, and members between 18 and 49 get the same general benefits as older members except for insurance products that are age-restricted by the policy or by law.1AARP. Membership Under Age 50 Standard membership costs $20 per year, with a $15 first-year rate for automatic renewal and discounts for multi-year sign-ups.2AARP. AARP Membership
AARP itself does not sell insurance. It lends its name to plans underwritten by private insurers, primarily UnitedHealthcare, and each plan has its own enrollment rules set by the insurer, not by AARP. Being a member is a prerequisite to apply, but it does not make you eligible. The prominent AARP-branded health plans are all Medicare products: Medicare Advantage, Medicare Supplement (Medigap), Part D prescription drug plans, and specialized plans for people with chronic conditions or dual Medicare-Medicaid eligibility.3AARP Medicare Plans from UnitedHealthcare. AARP Medicare Plans from UnitedHealthcare So if you are 45 and looking for AARP-branded major medical coverage, there is no product to buy. The one significant exception is dental: AARP endorses a Delta Dental plan that is not tied to Medicare and is available to members regardless of age.4AARP. AARP Dental Plan by Delta Dental Insurance Company
What Opens Up at 65
Most AARP-endorsed health coverage becomes available when you turn 65 and enroll in Medicare. At that point you can choose an AARP Medicare Advantage plan from UnitedHealthcare, which bundles Part A hospital coverage, Part B medical coverage, and often prescription drugs and extras like dental and vision into a single plan. You can also stay with Original Medicare and add an AARP Medigap policy to cover copayments, coinsurance, and deductibles that Medicare leaves behind, or enroll in a standalone AARP Part D plan for drug coverage.
Enrollment follows Medicare’s calendar. The Annual Election Period runs from October 15 through December 7, with coverage starting January 1, and a separate Medicare Advantage open enrollment period runs from January 1 through March 31 for people already in an Advantage plan who want to change.5Medicare. Joining a Plan Medicare Advantage and Part D enrollment is not based on health history. Insurers cannot reject you or charge more for pre-existing conditions during open enrollment.
Getting AARP Coverage Before 65
You do not have to wait until 65 if you become Medicare-eligible earlier. Three paths get you there:
- Social Security Disability Insurance. Medicare eligibility begins after a 24-month waiting period counted from the first month of disability benefit entitlement. If you had a prior period of disability, months from that earlier period may count toward the 24, depending on how recently the prior benefits ended.6Social Security Administration. Medicare Information
- End-stage renal disease. Coverage generally starts on the first day of the fourth month of dialysis treatments. It can begin sooner if you participate in a home dialysis training program at a Medicare-certified facility, or in the month you are admitted to a hospital for a kidney transplant.7Medicare. End-Stage Renal Disease
- ALS. Medicare eligibility begins the same month your disability benefits begin, with no waiting period.
Once Medicare kicks in through any of these pathways, you can enroll in AARP-endorsed Medicare Advantage and Part D plans on the same terms as someone who ages in at 65.
Medigap is different. Federal law does not require insurers to sell Medigap policies to people under 65, even if they have Medicare through disability.8Medicare. When Can I Buy a Medigap Policy Some states require it, some allow it only for people with specific conditions, and some offer no protection for under-65 buyers at all. Whether an AARP-branded Medigap policy is available to you before 65 depends entirely on where you live.
The Medigap Window You Only Get Once
For Medigap, the age question is really a timing question, and this is where people most often make expensive mistakes. Your Medigap Open Enrollment Period is a one-time, six-month window that starts the first day of the month you turn 65 and are enrolled in Medicare Part B.8Medicare. When Can I Buy a Medigap Policy During those six months, insurers must sell you any Medigap plan they offer at the standard price regardless of your health history. No medical questions, no surcharges for pre-existing conditions.
After that window closes, the protections mostly disappear. In most states, insurers can review your medical history, charge more based on chronic conditions or past hospitalizations, or deny your application entirely.8Medicare. When Can I Buy a Medigap Policy This catches people who initially picked Medicare Advantage and later want to move to Original Medicare with a supplement.
Federal law does carve out a narrow set of guaranteed issue rights, where insurers must sell you a Medigap policy without underwriting even outside the open enrollment window. These apply in specific situations like losing employer group coverage through no fault of your own, leaving a Medicare Advantage plan within 12 months of first joining one when you became Medicare-eligible, having your plan end or commit fraud, or moving out of your Medicare Advantage plan’s service area. Documentation is required.9Medicare. Buying a Medigap Policy
How Your State Changes the Picture
Two AARP members the same age in different states can face different Medigap prices and different options. States can extend open enrollment periods, add guaranteed issue rights beyond the federal minimums, and require insurers to sell to people under 65.8Medicare. When Can I Buy a Medigap Policy
State rules also govern how premiums are set. Insurers use one of three pricing methods:
- Community-rated. Everyone in a given area pays the same premium for the same plan regardless of age. Eight states require this approach for policyholders 65 and older.
- Issue-age. Your premium is based on the age at which you bought the policy and does not automatically increase as you get older, though rates can rise for other reasons.
- Attained-age. Premiums start low at 65 and automatically increase as you age. This is the most common model and can become expensive in later years.
Community-rated policies tend to cost more upfront but stay predictable. Attained-age policies look cheap at 65 and can be unaffordable by 80. Which pricing method your insurer uses is worth checking alongside the plan letter itself. Your state insurance department is the source for what rules apply where you live.
If You Are Still Working at 65
Turning 65 with employer coverage does not force you into Medicare or an AARP-endorsed plan. Which coverage pays first depends on employer size. For employers with 20 or more employees, the group plan pays first and Medicare pays second, and you can delay Part B enrollment without penalty as long as you have coverage through your own or a spouse’s employer. For employers with fewer than 20 employees, Medicare becomes primary at 65 and the employer plan drops to secondary, so enrolling in Part B usually makes sense to avoid gaps.10Centers for Medicare & Medicaid Services. MSP Employer Size Guidelines for GHP Arrangements
The employee count includes full-time and part-time workers, and for multi-employer plans, the 20-employee threshold applies if any single participating employer meets it. One thing to know before delaying: if you have been contributing to a Health Savings Account through a high-deductible health plan, enrolling in any part of Medicare ends your ability to make pre-tax HSA contributions starting the month coverage begins. Existing funds can still be spent tax-free on qualified medical expenses, including Medicare premiums and copayments.11Medicare Interactive. Health Savings Accounts and Medicare
If you plan to work past 65 at a large employer and want to keep contributing to an HSA, delaying Medicare enrollment is one reason to do so. If you plan to take an AARP Medicare Advantage or Part D plan, you can do that during your Initial Enrollment Period when you first sign up for Medicare, or during the Annual Election Period each fall once you are enrolled.