A 3rd Class Medical certificate is required for private pilot training and above. Because of the new “Basic Med” program offered by the FAA, pilots who hold a 3rd Class Medical need only renew their medical every 10 years, provided they fulfill the other “Basic Med” requirements. See: https://www.faa.gov/licenses_certificates/airmen_certification/basic_med/ for more information on Basic Med. If you are interested in a sport pilot license only, a valid U.S. driver’s license is required to show proof of medical fitness to fly.