Medicare Supplement Rates at 65: What to Expect

Most people have no idea that a 65-year-old woman in Florida can pay nearly three times more for the exact same Medigap plan than a 64-year-old woman who signed up just twelve months earlier. Same plan letter. Same benefits. Radically different bill.

I’ve been helping seniors sort out Medicare supplement insurance for two decades, and the single thing that trips people up more than anything else is misunderstanding how insurers actually price these plans over time. It’s not random. There’s a specific system, and once you understand it, you can make choices that save you tens of thousands of dollars over a retirement.

Let me walk you through what’s actually going on with Medigap rates by age, because most of the advice floating around online leaves out the parts that matter most.

The Three Pricing Methods (And Why This Choice Is Permanent)

Here’s where most people get it wrong. I thought for years that Medigap premiums simply went up with inflation every year. That’s not the full picture. Insurers use one of three rating methods, and the method determines everything about your long-term costs.

Community-rated (also called “no-age-rated”): Everyone in the plan pays the same premium regardless of age. A 72-year-old pays what a 65-year-old pays. Prices still rise with inflation and claims experience, but not because you’re getting older.

Issue-age-rated: Your premium is set based on how old you are when you first buy the policy, then stays at that baseline (adjusted only for inflation and medical costs). Enroll at 65, you pay the 65-year-old rate forever, adjusted forward. Enroll at 72, you pay more from day one and stay there.

Attained-age-rated: This is the one that sneaks up on people. Premiums are based on your current age every year. So they go up as you get older, on top of general inflation and insurer cost increases. The Centers for Medicare & Medicaid Services at cms.gov describes all three methods in their Medigap overview, but they’re appropriately neutral about which is “best.” I’m not: attained-age pricing almost always costs you more over a long retirement, even when the entry-point premium looks attractive.

The catch is that most plans sold today are attained-age-rated because they offer lower premiums at 65, which makes them easier to sell. Insurers aren’t doing anything sneaky exactly, but they’re betting you’ll focus on today’s number.

What the Numbers Actually Look Like

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As of August 2026, a 65-year-old male nonsmoker in Ohio can find Plan G premiums ranging from about $98 to $165 per month depending on the insurer and rating method. That same man at 75, with an attained-age policy, might be paying $190 to $260 per month for identical coverage. By 80, it’s not unusual to see $290 or higher with certain carriers.

Here’s a side-by-side comparison I put together using current rate data from multiple carriers. The numbers below are illustrative of realistic ranges based on available market data, not quotes from a single insurer, because rates vary by zip code, tobacco use, and carrier:

Read across that table from left to right at age 85 and let it sink in. The attained-age plan that looked $50 cheaper at 65 is now costing roughly $155 more per month than community-rated. That’s $1,860 per year extra, every year, at precisely the age when you can least easily switch to something cheaper.

The Open Enrollment Window Is Not a Suggestion

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Six months. That’s what you get. Starting the first month you’re both 65 and enrolled in Medicare Part B, federal law gives you a six-month Open Enrollment Period during which no insurer can deny you a Medigap policy, charge you more for health conditions, or make you wait for coverage to kick in. The AARP Medicare resource center calls this the single most important window in Medicare planning, and they’re right.

I had a reader, a retired schoolteacher from Tucson, email me a few years back. She’d heard she could “always switch later” and didn’t rush to enroll in a supplement plan during her Open Enrollment. She was healthy at 65, figured she’d get around to it. At 68 she had a cardiac procedure. By the time she wanted to enroll in Plan G, she was medically underwritten and rejected by three carriers. The fourth accepted her with a six-month rider excluding heart-related claims. That exclusion cost her over $14,000 out of pocket during a hospitalization the following year.

In most states, if you miss that window, insurers can and will underwrite you. “Guaranteed issue” rights exist in a few specific situations (your employer coverage ended, your Medicare Advantage plan left the area, etc.), but outside of those situations, your health becomes part of the equation.

A handful of states offer additional protections. Connecticut, Massachusetts, Maine, and New York all have guaranteed issue regardless of when you apply. Minnesota has its own standardized plan structure. If you live in one of those states, you have more flexibility. If you don’t, treat your Open Enrollment Period like a deadline you cannot miss.

Gender, Tobacco, and Geography All Move the Number

What most people don’t realize is that beyond age and rating method, three other factors can shift your Medigap premium significantly.

Gender: Most states allow insurers to charge women differently than men (or vice versa). In practice, women often pay less at 65 in attained-age plans because their expected claims at that age are lower, but the gap can narrow or reverse in older brackets depending on the insurer’s actuarial assumptions. This is worth explicitly asking about when comparing quotes.

Tobacco use: If you smoke, expect a surcharge of 10-25% on top of standard rates, depending on the state and carrier. Some states prohibit tobacco rating for Medigap. It’s worth checking your state’s rules.

Geography: This is the biggest wildcard. A 67-year-old woman in rural Mississippi might pay $92/month for Plan N, while the same woman in suburban New York pays $220 for identical coverage. Healthcare costs, claims experience, and state regulation all feed into this. I don’t have precise national averages I’d trust for every state, so I’d point you to Medicare.gov’s plan finder tool as the most current source for your specific zip code.

A worked example of how these factors compound:

A 65-year-old male smoker in Florida, choosing an attained-age Plan G → pays roughly $165/month at enrollment due to tobacco surcharge and Florida’s higher market rates → by age 78, that premium has grown to approximately $310/month, compared to about $195/month for a non-smoking woman of the same age in Ohio who chose a community-rated plan.

That gap compounds every year. Over thirteen years, the difference in cumulative premiums can easily exceed $20,000.

Plan G vs. Plan N: The Age-Rate Interaction

One thing I wish I’d explained to people more clearly earlier in my career: the pricing method interacts with which plan you choose. Plan N currently runs about 15-20% cheaper than Plan G at enrollment for most 65-year-olds. That sounds great. But Plan N has cost-sharing (up to $20 copays for office visits, up to $50 for ER visits, and you’re exposed to Part B excess charges). As you age and use more healthcare, those out-of-pocket costs add up alongside a rising attained-age premium.

Plan G covers nearly everything except the Part B deductible (currently $257 in 2026). For someone who sees specialists frequently or anticipates complex care, the math often favors Plan G by the mid-70s even if Plan N looked cheaper at 65.

Second worked example: A 65-year-old man enrolls in attained-age Plan N at $92/month, expecting to save money → by 73, his premium is $178/month and he’s paying an average of $340/year in copays due to regular specialist visits → total annual cost: $2,476. A neighbor who enrolled in community-rated Plan G at $155/month pays $1,860/year with zero additional cost-sharing. The Plan G buyer saves $616 annually at that point, with the gap widening each year.

Sources

• Centers for Medicare & Medicaid Services (CMS): Official federal resource on Medigap pricing methods, standardized plan letters, and enrollment rules.
• Medicare.gov Plan Finder: Current premium quotes by zip code, plan letter, and age; updated regularly with carrier data.
• AARP Public Policy Institute: Research on Medigap enrollment patterns, state-by-state market analysis, and affordability trends for Medicare beneficiaries.
• Kaiser Family Foundation (KFF): Independent analysis of Medicare supplement market concentration, premium trends, and beneficiary cost exposure.
• National Association of Insurance Commissioners (NAIC): NAIC Medigap Shopper’s Guide, which details rating method rules by state and consumer rights at enrollment.

Photo: Kampus Production via Pexels

This article is for informational purposes only. Medicare rules change annually. Always verify current plan details at Medicare.gov or by calling 1-800-MEDICARE (1-800-633-4227). This site does not sell insurance or recommend specific plans.

Recommended Resources

Disclosure: As an Amazon Associate, we earn a small commission from qualifying purchases at no extra cost to you. We only recommend products that genuinely support the topics covered in this article.

• Medicare For Dummies (~$22), The definitive consumer guide to Medicare, enrollment windows, Part A/B/C/D, and supplement plans.
• Get What’s Yours for Medicare (~$17), Maximize your Medicare benefits and minimize out-of-pocket costs. Covers Part D drug coverage gaps and Medigap in depth.