Free Flu Vaccine Clinic (San Mateo) October 28 @ 4:00 pm - 7:00 pm Free Flu Vaccine Clinic San Mateo Medical Center- Senior Care Center 222 West 39th Avenue, First Floor, San Mateo Ages: 18 years and older The following vaccines will be available: Flu and high dose Flu vaccine for adults 65 years and older. No appointment, ID or health insurance is needed Insured individuals can get the vaccine from their health care provider or pharmacy. Clinic information subject to change.