instruction: give me the number of patients whose year of birth is less than 2065 and procedure long title is prophylactic administration of vaccine against other diseases?
response: SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic INNER JOIN procedures ON demographic.hadm_id = procedures.hadm_id WHERE demographic.dob_year < "2065" AND procedures.long_title = "Prophylactic administration of vaccine against other diseases"