In every state that runs a medical cannabis program, the age to get a medical marijuana card on your own is 18. Patients younger than 18 can still qualify for serious medical conditions, but a parent or legal guardian has to register as the child’s caregiver and handle the purchase, storage, and administration of the product. That framework is remarkably consistent across the roughly 40 states and the District of Columbia with medical programs, even though the finer rules shift from state to state.
Why 18 Is the Line
At 18 you can register as a patient in your own name, see a certifying physician, and buy medical cannabis from a licensed dispensary without anyone else’s involvement. Recreational cannabis laws, by contrast, almost universally set the floor at 21. The gap exists because medical programs are built around a physician-patient relationship: if a doctor certifies that cannabis would help your condition, the state treats you the way it would for any other medical treatment available to legal adults.
A handful of state proposals have floated restricting medical cards to patients 21 and older, but none have gained traction. The working consensus is that an adult patient with a documented condition and a physician’s certification should not face a higher age barrier than the one that already governs general medical consent.
How Patients Under 18 Qualify
Children and teenagers with serious conditions are not shut out. Every state with a medical cannabis program has a pathway for patients under 18, though the requirements are stricter than for adults. Four pieces show up in almost every state’s rules.
A custodial parent or legal guardian must register as the minor’s designated caregiver. In most states the caregiver must be at least 21, pass a background check, and take full responsibility for buying, storing, and giving the cannabis product to the patient. The minor cannot buy or possess medical cannabis on their own.
Where an adult typically needs one physician certification, many states require two for a minor, often a primary care physician plus a specialist familiar with the child’s condition. The extra sign-off is meant to add medical oversight before cannabis is approved for a developing brain.
States commonly require proof that the caregiver is actually the child’s parent or legal guardian: a birth certificate, adoption decree, or court order establishing guardianship. Separately, many programs require a signed consent form specifically authorizing the minor’s participation.
The caregiver’s card is tied to the minor’s card. If the caregiver’s registration lapses or is revoked, the minor loses access too. Caregivers are also typically capped at a small number of patients, often no more than three, to keep the system from being used as a workaround for distribution.
Can a Minor Patient Use Medical Cannabis at School?
This is the practical question most parents of minor patients ask next. A growing number of states, including Colorado, Illinois, Maine, New Jersey, Florida, and Washington, have passed laws allowing caregivers to administer non-smokable medical cannabis products on school grounds. The common features: only a parent, guardian, or registered caregiver can administer the product, smoking and vaping are prohibited on campus, and students cannot be disciplined for using medical cannabis in compliance with the program.
In states without an explicit school-access law, the default position is usually no. Schools that receive federal funding face pressure to maintain drug-free campus policies, and administrators tend to be cautious. The practical workaround most families use in those states is off-campus administration by the caregiver during the school day.
Age Alone Is Not Enough: You Need a Qualifying Condition
Being old enough does not entitle you to a card. You also need a diagnosed condition your state recognizes as qualifying, and a physician willing to certify that cannabis is an appropriate treatment. The specific list varies by state, but a core set of conditions shows up almost everywhere:
- Chronic pain, by a wide margin the most common qualifying condition and the reason most cardholders cite on their applications.
- Cancer, including the side effects of treatment such as nausea, wasting, and pain.
- Epilepsy and seizure disorders, particularly relevant for minor patients and one of the conditions with the strongest clinical evidence behind cannabis treatment.
- PTSD, recognized in a majority of medical cannabis states.
- Multiple sclerosis, specifically for persistent muscle spasms.
- HIV/AIDS, including associated wasting syndrome and nausea.
- Crohn’s disease and inflammatory bowel conditions.
- Glaucoma.
Some states also include anxiety, autism, Alzheimer’s disease, and arthritis. A few have adopted open-ended language letting physicians certify any condition they believe cannabis would benefit, which effectively leaves the decision to the doctor’s clinical judgment rather than a fixed checklist.
How the Application Works Once You’re Eligible
For adults, the process is fairly straightforward in most states. You register through your state health department’s online portal, see a physician certified to recommend medical cannabis, and submit the certification along with proof of identity and state residency. Once approved, you receive a medical marijuana card, increasingly a digital card accessible through a state app, though physical cards are still issued in many programs.
For minor patients the process adds steps. The caregiver has to register and be approved before the minor’s application can go through. The submission package includes the caregiver’s registration, the minor’s identity documents, proof of the legal relationship, the required multiple physician certifications, and the signed parental consent form. Some states route minor applications through a separate review that takes longer than the standard adult timeline.
Physician Evaluation
The physician evaluation is the gatekeeping step and the most significant out-of-pocket cost. Expect to pay between $100 and $300 for the initial certification appointment, depending on your state and provider. A growing majority of states now allow these evaluations to happen via telehealth for first-time patients, which has made access easier in rural areas and in states with few certifying physicians. A smaller number of states still require the initial evaluation to be in person and allow telehealth only for renewals.
State Filing Fees
On top of the physician cost, most states charge an application or registration fee. These fees generally fall between $50 and $200, with reduced fees in some states for veterans, Medicaid recipients, or patients meeting certain income thresholds. The fee is separate from the doctor visit and goes directly to the state when you submit your application.
Keeping the Card Current
Medical marijuana cards do not last forever. Most states issue cards that expire after one year, so you renew annually. A few states allow longer registration periods. Maryland, for example, keeps patient registrations active for six years, though even those states typically require a fresh physician certification every 12 months to confirm the qualifying condition still exists and cannabis remains an appropriate treatment.
Renewal is simpler than the initial application. You’ll need a follow-up evaluation with a certifying physician, often available via telehealth even in states that require the first visit in person, and you’ll pay the state’s renewal fee, which is usually the same as the initial application fee. Timing matters: most states let you start the renewal 30 to 45 days before your card expires. If you let the card lapse, you lose legal protection until the renewal clears, and in some states you may have to restart the entire application from scratch.