Adults 65 and older are recommended to get two COVID-19 vaccine doses per year, spaced about six months apart. This makes seniors the only age group routinely advised to get more than one annual dose, reflecting the higher risk of severe illness and the faster decline in vaccine protection that comes with aging.
The Current Schedule for Adults 65 and Older
The CDC’s 2025–2026 guidance recommends two doses of an updated COVID-19 vaccine for people 65 and older. The first dose can be given at least eight weeks after your last COVID-19 vaccine (or at least three months for certain Moderna formulations). The second dose follows about six months later, with a minimum gap of two months between the two.
For most other adults, a single annual dose is sufficient. The twice-yearly schedule for seniors exists because protection against hospitalization drops more quickly in older adults. Data from the 2024–2025 season showed the updated vaccine reduced COVID-related hospitalizations in adults 65 and older by roughly 45% during the first four months after vaccination. After that window, effectiveness continues to decline, which is why a second dose is built into the schedule.
If you’ve recently had COVID-19, you can delay your next dose by three months from when symptoms started (or from the date of a positive test if you had no symptoms). This delay takes advantage of the natural immune boost from infection without skipping the vaccine entirely.
Why Protection Fades Faster With Age
The immune system changes significantly as people age, a process researchers call immunosenescence. Several things happen at once: the cells responsible for fighting infections become less responsive to activation signals, the body produces fewer naive immune cells capable of learning new threats, and the energy machinery inside immune cells becomes less efficient. Free radical damage accumulates in immune cell DNA over time, further reducing their effectiveness.
These changes don’t mean vaccines stop working for older adults. They do mean the protection peaks lower and drops off sooner compared to younger people. That faster decline is the core reason behind the six-month second dose. It essentially refreshes the immune response before it dips too low to offer meaningful protection against severe illness.
Guidance for Immunocompromised Seniors
Seniors with weakened immune systems, whether from conditions like cancer, organ transplants, or medications that suppress immunity, may be eligible for additional doses beyond the standard two per year. The CDC allows extra doses at least two months apart after the most recent updated vaccine, based on a conversation with a healthcare provider. You don’t need documentation to confirm your immunocompromised status; self-reporting is accepted at vaccination sites.
Getting Flu, COVID, and RSV Vaccines Together
You can receive your COVID-19 vaccine at the same visit as a flu shot and an RSV vaccine if the timing lines up for each one. Studies support the safety of coadministration, and there’s no required waiting period between them. If multiple shots are given in the same arm, they should be at least one inch apart, though you can also split them between arms. For seniors who prefer to minimize trips to a pharmacy or clinic, combining fall and winter vaccines into a single visit is a practical option.
What Side Effects to Expect
The most common reactions are the same ones reported since the vaccines first became available: soreness at the injection site, fatigue, headache, muscle aches, and occasionally fever or chills. These typically show up within one to three days and resolve within one to three days. Most symptoms are mild to moderate. Older adults actually tend to report fewer and less intense side effects than younger people, likely because of the same age-related immune changes that make the extra dose necessary in the first place.
Serious side effects like heart inflammation (myocarditis or pericarditis) have been reported rarely across all age groups, with the highest rates seen in younger males rather than older adults.
Cost and Medicare Coverage
Medicare Part B covers updated COVID-19 vaccines at no cost to you, as long as your provider accepts Medicare assignment. This applies to all available formulations. If you’re enrolled in a Medicare Advantage plan, you’ll need to use an in-network provider to avoid charges, but the vaccine itself remains free. For seniors without Medicare, most private insurance plans also cover COVID-19 vaccines without a copay, and the federal Bridge Access Program has provided free vaccines for uninsured adults, though availability of that program can vary.
Keeping Track of Your Schedule
The simplest approach is to pair your first COVID-19 dose with your annual flu shot in the fall, then get your second COVID-19 dose about six months later in the spring. This creates a natural rhythm that’s easy to remember and keeps your protection refreshed heading into both the winter respiratory season and the summer wave that has emerged in recent years. Each year’s updated vaccine targets the variants currently circulating, much like the annual flu shot is reformulated each season.