Quick answer
Every US state that allows adult-use cannabis sets the minimum age at 21 for buying, possessing, and consuming. Medical cannabis programs use a lower floor, most often 18, and patients younger than that need a parent or legal guardian registered as a caregiver. Outside the United States, legal ages run from 18 to 21, with 18 the most common. Counts change as new laws pass, so confirm the rule for the state or country where you plan to buy.
Age limits in adult-use states
Two dozen states plus the District of Columbia have legalized cannabis for adults, and all of them use 21 as the purchase age. That list includes California, Colorado, Washington, Oregon, Nevada, Arizona, New Mexico, Montana, Illinois, Michigan, Ohio, Minnesota, Missouri, Maryland, Delaware, New Jersey, New York, Connecticut, Massachusetts, Maine, Vermont, Rhode Island, and Virginia. Some of these states restrict where you may consume, but the age rule stays the same.
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- An out-of-state ID works. A valid, current government photo ID from any state or country proves age at a dispensary.
- An expired ID does not. Staff must verify, and an expired license fails that check.
Medical cannabis and patients under 21
Medical programs set their own age floor, and 18 is the standard. A patient who is 18 or older can usually apply for a card without a parent involved. Patients younger than 18 need a caregiver, and in most states that caregiver must be a parent or legal guardian. The caregiver registers with the state, buys on the patient's behalf, and carries the card at the register. Pediatric patients commonly qualify for a narrow set of conditions such as severe epilepsy, and some states limit them to low-THC products.
What happens below the age limit
Buying cannabis under 21 is a misdemeanor in most legal states, and using a fake ID adds a separate charge. A dispensary that sells to a minor risks its license, so staff check ID at the door and again at checkout. Possession by a minor often moves to juvenile court rather than adult court.
Age limits outside the United States
- Canada: 18 in Alberta and Quebec, 19 in the remaining provinces and territories.
- Germany: 18 for adults, with home growing of up to three plants allowed.
- Mexico: 18.
- Malta: 18.
- Luxembourg: 18.
- Netherlands: 18 in licensed coffeeshops.
- Uruguay: 18 for residents enrolled in the state registry.
Legal age is not the same as legal access for visitors. Several countries limit sales to residents or registry members.
How to confirm you clear the age rule before you order
- Identify the state or country where you will buy and look up its minimum age.
- Check that your ID is current and government issued.
- For a medical purchase, confirm the patient age floor and whether a caregiver is required.
- Bring the physical ID, since most stores do not accept photos or digital copies.
- If you are buying for a patient under 18, bring the caregiver paperwork the state issued.