Frequently asked questions How old do I have to be to apply for a Florida medical marijuana certificate and card? Patients must be aged 18 years old or over in order to qualify for a Florida medical marijuana card on their own. Caregivers must be 21 years old or over. Caregiver fills out their own application form, and must be listed on the patient’s application form as well. Patients under 18 who are in need of a medical marijuana card must have a caregiver. Those who are over the age of 18 but cannot access medicinal cannabis on their own may also require a caregiver.