คนไข้ปีเกิดน้อยกว่าปี 2565 มีกี่ราย ไม่จำเป็นต้องใช้ทุกตาราง
what is the number of patients whose year of birth is less than 2065?It is not neccessary to use all the tables.
 prescriptions:  subject_id [ text]  hadm_id [ text]  icustay_id [ text]  drug_type [ text]  drug [ text]  formulary_drug_cd [ text]  route [ text]  drug_dose [ text] 
SELECT COUNT(DISTINCT demographic.subject_id) FROM demographic WHERE demographic.dob_year < "2065"