The current number of Medicare enrollees in the United States

As of 2024, approximately 67 to 68 million people are enrolled in Medicare. This number has grown steadily over the past decade as the population ages and more people reach age 65, the standard age for Medicare may be able to access. The exact figure changes month to month as people turn 65, enroll in the program, or pass away.

Medicare enrollment is split across different parts of the program. Most enrollees are covered by Original Medicare (Parts A and B), while others choose Medicare Advantage plans (Part C) as an alternative way to receive their benefits. Many also add prescription drug coverage through Part D. Some people are enrolled in multiple parts at the same time.

Key Takeaways

  • Roughly 67 to 68 million Americans are currently enrolled in Medicare, with numbers growing as the Baby Boomer generation ages.
  • About 42 to 43 million beneficiaries are age 65 and older, while the remaining 24 to 25 million are younger people with disabilities or end-stage renal disease.
  • Enrollment in Medicare Advantage plans has grown significantly in recent years, now covering roughly one-third of all Medicare beneficiaries.
  • The number of people on Medicare is expected to continue rising, reaching over 80 million by 2030 as more Baby Boomers turn 65.

Who makes up the Medicare population

The majority of Medicare enrollees — roughly 42 to 43 million people — are age 65 and older. These are people who became may be able to access for Medicare when they turned 65, regardless of their work history or income level. This group includes both people who worked and paid Medicare taxes throughout their careers and those who became may be able to access through a spouse's work record.

The remaining 24 to 25 million Medicare beneficiaries are younger than 65. They may have access to through different pathways: some have been on Social Security Disability Insurance (SSDI) for at least two years, some have end-stage renal disease requiring dialysis or a transplant, and some have amyotrophic lateral sclerosis (ALS). These younger beneficiaries represent a smaller but important part of the Medicare population.

How Medicare enrollment has changed over time

Medicare enrollment has nearly doubled since the program began in 1965, when it covered about 19 million people. The growth accelerated in the 2010s as the Baby Boomer generation — people born between 1946 and 1964 — began turning 65. Each year, roughly 2 to 3 million more people become may be able to access for Medicare at age 65.

The shift toward Medicare Advantage plans represents one of the most significant changes in recent years. In 2010, about 10 million beneficiaries (roughly 14 percent) were enrolled in Medicare Advantage. By 2024, that number had grown to approximately 28 to 30 million people (roughly one-third of all beneficiaries). This trend reflects both marketing efforts by insurance companies and genuine interest from beneficiaries in plans that may offer additional benefits.

Regional differences in Medicare enrollment

Medicare enrollment is not evenly distributed across the country. States with older populations, such as Florida, Maine, and West Virginia, have higher percentages of Medicare beneficiaries relative to their total population. States with younger populations, such as Utah and Alaska, have lower percentages.

Urban and rural areas also show different enrollment patterns. Rural counties often have higher concentrations of Medicare beneficiaries, partly because younger people tend to move to cities for work. This affects which types of Medicare plans and providers are available in different regions, since insurance companies and doctors make decisions based on local demand and population density.

Projected growth in Medicare enrollment

Medicare enrollment is expected to grow significantly over the next several years. Demographers project that by 2030, roughly 80 million people will be enrolled in Medicare — an increase of about 12 to 15 million from today. This growth is driven almost entirely by aging Baby Boomers reaching age 65, not by changes in may be able to access rules or increases in the younger disabled population.

This projected growth has major implications for Medicare's finances and for the healthcare system overall. More beneficiaries means higher spending on hospital care, doctor visits, and prescription drugs. It also means more demand for healthcare workers and facilities, which already face shortages in many parts of the country.

Why these numbers matter for your planning

Understanding how many people are on Medicare can help you think about your own healthcare future. If you are approaching age 65, knowing that millions of others are navigating the same transition can help you recognize that Medicare enrollment is a normal, well-established process — not something new or experimental.

The size of the Medicare population also affects the programs and services available to you. Large enrollment numbers mean that Medicare has significant bargaining power with hospitals and drug manufacturers, which can influence what you pay. At the same time, high enrollment in certain areas can mean longer wait times for appointments or fewer choices of doctors and plans in your region.

Frequently Asked Questions

How many people on Medicare are under age 65?

Roughly 24 to 25 million Medicare beneficiaries are younger than 65. They may have access to through disability (having received SSDI for at least two years), end-stage renal disease, or ALS. This group represents about one-third of all Medicare enrollees.

Is Medicare enrollment still growing?

Yes. Medicare enrollment grows by roughly 2 to 3 million people per year as Baby Boomers turn 65. This growth is expected to continue through the 2030s, after which the rate of growth will slow as smaller age groups reach 65.

What percentage of Americans are on Medicare?

Roughly 20 percent of the total U.S. population is enrolled in Medicare. This percentage is higher among people age 65 and older — about 95 percent of that age group has Medicare coverage — and much lower among working-age adults.

Do all states have the same number of Medicare beneficiaries?

No. States with older populations, like Florida and Maine, have significantly more Medicare beneficiaries both in total numbers and as a percentage of their state population. Younger states like Utah have far fewer. This affects the availability of Medicare plans and providers in different regions.

Will Medicare enrollment keep growing after 2030?

Growth will continue but at a slower pace. After the Baby Boomer generation has mostly turned 65, enrollment growth will depend mainly on people living longer and on changes in may be able to access for younger disabled beneficiaries. Demographers expect enrollment to level off sometime in the 2040s.