How much does Medicare supplement insurance cost at age 65?

At age 65, Plan G (the most popular Medigap plan) typically costs $120–$160 monthly, or $1,440–$1,920 annually, depending on your state and insurer. Costs vary significantly by location—a Plan G policy in New York might cost $180+ monthly, while the same plan in Iowa could be $130. Use our calculator to get specific quotes for your ZIP code.

Why does Medicare supplement insurance cost more as you age?

Insurance companies use attained age rating, which increases premiums annually as you get older because older adults typically have higher medical costs. With attained age rating, your premium at 75 could be 70–80% higher than at 65 for the same plan. Issue age rating avoids this by locking in your age at enrollment, though initial premiums are higher.

Is it cheaper to buy Medicare supplement insurance early or wait?

It's almost always cheaper to buy Medigap at 65 during your guaranteed-issue enrollment period. Waiting until you're older means permanently higher premiums with most rating methods, plus you risk being denied coverage or facing medical underwriting requirements if you have pre-existing conditions. Delaying can cost $10,000–$30,000 over your lifetime.

Can I switch Medicare supplement plans if my premium gets too expensive?

Yes, you can switch Medigap plans during the annual open enrollment period (January 1–March 31) without medical underwriting, even if you've had health changes. Some states also allow switches in July. However, switching may result in a different premium. Always compare rates across insurers annually—you could save $50–$100 monthly by switching to a competitor.

What's the difference between Medicare supplement insurance and Medicare Advantage?

Medicare supplement (Medigap) works alongside Original Medicare and covers gaps like deductibles and coinsurance. Medicare Advantage is an alternative to Original Medicare, offered by private insurers, with lower premiums but higher out-of-pocket costs and network restrictions. Medigap costs more upfront but typically saves money for high-healthcare-use individuals. Your age affects both options' costs differently.

Medicare Supplement Insurance Cost by Age: 2024 Rates

What is Medicare Supplement Insurance and Why Does Age Matter?

Medicare supplement insurance, also known as Medigap, covers costs that Original Medicare doesn't—like copayments, coinsurance, and deductibles. Unlike Original Medicare, which is federal health insurance for people 65 and older, Medigap is sold by private insurance companies and becomes increasingly expensive as you age.

Your age is one of the most significant factors determining your Medigap premium. Insurance companies in the United States use a rating system where older enrollees typically pay higher premiums than younger ones. This age-based pricing can make a substantial difference over time, particularly if you're comparing costs across your 60s, 70s, and 80s.

Understanding how Medicare supplement insurance cost by age works helps you budget for healthcare expenses in retirement and make informed decisions about your coverage. Whether you're approaching 65 or already enrolled in Medicare, knowing how premiums scale with age is essential for long-term financial planning.

How Medicare Supplement Premiums Are Calculated by Age

Insurance companies use three primary rating methods to set Medigap premiums: attained age, issue age, and community rated. Each method affects how much you'll pay based on your age.

Attained Age Rating is the most common approach. Your premium increases annually as you get older, meaning a 65-year-old might pay $120 per month for Plan G, but by age 75, that same plan could cost $210 monthly. This method results in the highest long-term costs but lower initial premiums.

Issue Age Rating locks in your age when you first purchase the policy. If you enroll at 65, your premium remains based on that age even when you're 75. While premiums still increase annually for inflation, they won't jump due to aging. This method typically has higher initial costs but better long-term savings.

Community Rated plans charge everyone the same premium regardless of age (with minor variations for gender in some states). These plans are rare and usually more expensive upfront but can save money for older adults.

Each state regulates which rating methods insurers can use. For example, Florida, Connecticut, and Maryland restrict certain rating methods, while other states allow more flexibility. Additionally, your gender, health status (in most cases), and specific Medigap plan letter (A, B, C, D, F, G, K, L, M, or N) influence your final premium.

Medicare Supplement Insurance Costs by Age: 2024 Pricing Table

The table below shows estimated average monthly premiums for Plan G (the most popular Medigap plan) across different ages in 2024, using attained age rating. Actual costs vary by state, insurance company, and specific plan selection.

Age	Plan G Monthly Premium (Est.)	Annual Cost	10-Year Total
65	$120–$160	$1,440–$1,920	$15,000–$22,000
70	$155–$210	$1,860–$2,520	$19,000–$28,000
75	$195–$270	$2,340–$3,240	$24,000–$35,000
80	$245–$330	$2,940–$3,960	$30,000–$42,000
85	$305–$415	$3,660–$4,980	$37,000–$52,000

These figures are estimates based on national averages and can vary significantly. For example, someone in New York or California typically pays 20–40% more than someone in Tennessee or Iowa. The type of rating method used (attained vs. issue age) can mean a difference of $50–$100+ monthly by age 80.

To get accurate quotes for your specific situation, use our free calculator which pulls real rates from major insurers like Mutual of Omaha, Cigna, and AARP.

Factors Beyond Age That Affect Your Medigap Premium

While age is the primary driver of premium costs, several other factors influence what you'll pay for Medicare supplement coverage:

Geographic Location: Your state and ZIP code significantly impact rates. Urban areas often cost more than rural regions, and some states have stricter rate regulations than others.
Medigap Plan Type: Plan F was the most comprehensive but is no longer available to new enrollees (only those turning 65 before January 1, 2020). Plan G now offers similar coverage. Plans A, B, and L are cheaper but cover fewer expenses.
Insurance Company: Different insurers price identically-lettered plans differently. Comparing quotes from 5–10 companies can save you $30–$60 monthly.
Gender: A few states still allow gender-based pricing. Men often pay slightly more than women for identical coverage.
Smoking Status: Unlike traditional health insurance, Medigap insurers rarely use smoking status as a rating factor, so smokers aren't penalized.
Health History: Medigap is guaranteed-issue during your 6-month open enrollment period (starting the month you turn 65 and enroll in Medicare Part B). After this period, insurers can deny coverage or charge more based on pre-existing conditions in some states.

Age-Based Strategy: When to Enroll and How to Save

Your enrollment age has profound long-term financial implications. Enrolling at 65 is almost always the best decision financially, even if you have employer coverage or still work. Here's why:

Lock in Lower Rates: With issue age rating, your age 65 premium becomes your baseline forever. Waiting until 75 means permanently higher premiums compared to enrolling at 65.
Guaranteed Issue Rights: During your 6-month open enrollment window (when you turn 65 and enroll in Medicare Part B), insurers must sell you any Medigap plan without medical underwriting. After this window, they can deny you or charge significantly more.
Employer Coverage Exception: If you or your spouse has retiree health insurance from an employer, you may have additional time to enroll without penalties. Verify this with your HR department—the rules are complex.
Shop Annually: Even after your initial enrollment, review rates every year. Each January and July, you may switch plans or insurers without evidence of insurability. Some people save $50–$100 monthly by switching.

Comparing this to retirement savings vehicles: if you enroll late and pay $100 more monthly due to your older age, that's $1,200 annually—equivalent to missing out on compound growth from a Roth IRA or standard brokerage account earning 7% annually. Over 20 years, that extra cost compounds significantly.

Key Takeaways: Medicare Supplement Insurance Cost by Age

Age is the primary premium driver: Expect to pay 100–150% more for the same Medigap plan at age 85 compared to age 65.
Rating method matters: Attained age plans start cheaper but cost more over time. Issue age plans have higher initial premiums but lock in your age.
Enroll at 65: Your 6-month guaranteed-issue window is critical. Waiting costs thousands over your lifetime.
Shop annually: Rates vary widely by insurer. You can switch plans each January without medical underwriting.
Plan G is typically best: It covers most out-of-pocket costs and is the most popular choice among new enrollees since Plan F was discontinued.
State and location matter: Your ZIP code can mean $50–$100+ monthly differences in premiums for identical coverage.
Use comparative tools: Our free calculator compares real rates from major insurers in your area, helping you make data-driven decisions.

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