Whether blood pressure is normal if the diastolic pressure is 70 mmHg and the systolic pressure is 100 mmHg should be determined by age. Normally, it is 95/65mmHg for 1 month old, 84/54mmHg for 1 year old, 110/65mmHg for 10-13 years old, 120/70mmHg for 14-17 years old, 120/80mmHg for adults, and 140-160/80-90mmHg for the elderly. so, blood pressure of 100/70mmHg is normal for teenagers as well as adults The range, but belongs to the borderline state, must be careful to avoid eating or taking food or drugs that affect blood pressure, taking drugs that slightly affect blood pressure, may cause patients to have low blood pressure. For the elderly group, the blood pressure is low and should be adjusted promptly. In the case of hypertensive patients, certain medications should be stopped accordingly under the guidance of a physician, and the blood pressure should not be lowered too low, instead of better maintaining cerebral perfusion. In addition, adult blood pressure fluctuates significantly day and night during the day, with higher levels in the early morning and lowest at midnight, so blood pressure values should also be judged according to the time of day.