There is no universal minimum age to qualify for medical marijuana. Most U.S. states set 18 as the age you can apply for a medical cannabis card on your own, but patients younger than 18 can qualify in many states as long as a parent or legal guardian acts as their caregiver. The rules vary significantly by state and country, so where you live matters as much as how old you are.
Age 18: The Standard Threshold
In most U.S. states with medical marijuana programs, 18 is the age at which you can independently apply for a medical cannabis card, see a certifying physician on your own, and purchase products at a dispensary. A handful of states set the independent access age at 21 instead, aligning it with recreational cannabis laws.
If you’re between 18 and 20, some states impose extra restrictions. You may face limits on THC concentration, require additional physician sign-offs, or be restricted to certain product types. These rules change frequently as states update their cannabis programs, so checking your state’s health department website is the most reliable way to confirm current requirements.
How Minors Qualify
Patients under 18 can access medical cannabis in many states, but the process involves more steps. A parent or legal guardian must register as a designated caregiver, which means they’re the ones who purchase, hold, and administer the cannabis products. The minor patient still needs a physician’s written certification confirming a qualifying medical condition.
In Arkansas, for example, the designated caregiver must be at least 21 years old. Parents of a minor patient are exempt from the criminal background check that other caregivers must complete, though they still register and pay the application fee. Many states follow a similar model: the caregiver handles everything at the dispensary while the minor remains the certified patient on paper.
Some states require two physician recommendations instead of one when the patient is a minor, adding an extra layer of medical oversight. Others require that one of those physicians be a specialist in the child’s condition. Georgia, for instance, relies entirely on physician judgment for its low-THC oil registry, giving doctors full discretion over whether to certify any patient, including children.
Product Restrictions for Younger Patients
Even when minors qualify, they typically face tighter rules on what forms of cannabis they can use. Illinois limits minor patients to cannabis-infused products only, which means edibles, tinctures, and oils rather than smokable flower or vape cartridges. This restriction is common across states and reflects concerns about the effects of smoking or inhaling on developing lungs.
Several states also cap THC levels for minor patients or require that products have a higher ratio of CBD to THC. The general trend is to steer younger patients toward lower-risk delivery methods and formulations, even if adult patients in the same state have access to the full product menu.
Conditions That Qualify Children
The strongest medical evidence for cannabis use in children involves treatment-resistant epilepsy, particularly Dravet syndrome and Lennox-Gastaut syndrome. Purified CBD has been studied most extensively for these conditions and is the basis for the only FDA-approved cannabis-derived medication.
Beyond epilepsy, states increasingly recognize other pediatric conditions. Irritability associated with autism spectrum disorder is one of the more common reasons families seek medical cannabis for children, typically using CBD-rich strains rather than high-THC products. Tourette syndrome and muscle spasticity from conditions like cerebral palsy are also being treated with medical cannabis in some jurisdictions, though the evidence base is thinner than it is for epilepsy.
Each state maintains its own qualifying conditions list, and not every state that allows adult medical cannabis automatically extends access to minors for the same conditions. Some states have a separate, shorter list of conditions that qualify pediatric patients.
How It Works Outside the U.S.
Other countries take different approaches, but the pattern of tighter oversight for younger patients holds everywhere. In Australia, any doctor can become an authorized prescriber of medical cannabis for adult patients over 18. For patients under 18, the rules tighten considerably. Only non-GP specialists with a relevant pediatric specialty can prescribe most categories of medical cannabis to children, and they need approval from a human research ethics committee. Lower-risk products (classified as Category 1) are somewhat easier to access for children, but still require specialist support or proof that the prescriber’s practice covers child health.
Canada allows medical cannabis for patients of any age with a physician’s authorization, though pediatric patients need a parent or guardian to manage their supply. The UK similarly permits specialist physicians to prescribe cannabis-based medicines to children, most commonly for severe epilepsy.
The common thread internationally is that no country outright bans medical cannabis for children. Instead, they add layers of specialist oversight and restrict the types of products available, treating pediatric access as a higher-scrutiny version of the adult pathway rather than a separate system.
How to Check Your State’s Rules
Because medical cannabis laws change frequently, your most reliable source is your state’s department of health or its dedicated cannabis regulatory agency. Search for your state name plus “medical marijuana program” to find the official page. Look specifically for sections on patient eligibility, age requirements, and caregiver registration if you’re researching access for someone under 18.
If you’re a parent exploring this for a child, the first practical step is a conversation with your child’s treating physician. Even in states with broad qualifying conditions, the physician’s willingness to certify the patient is what ultimately opens the door. Some physicians are comfortable with cannabis recommendations and others are not, regardless of what the law permits.