Normal blood pressure for 80 to 90 year olds includes a normal range of 90 to 139 mmHg for systolic blood pressure and 60 to 89 mmHg for diastolic blood pressure. Adults have a stable blood pressure at rest, with a normal range of 90 to 139 mmHg for systolic blood pressure and 60 to 89 mmHg for diastolic blood pressure, whereas epidemiologic blood pressure shows that systolic blood pressure in the population increases with age, so it is sufficient to control the blood pressure in the range of 90 to 149 mmHg in the 80- to 90-year-olds. The measurement of blood pressure is affected by a number of factors, such as per-pulse output, heart rate, peripheral resistance, and so on. Therefore, it is important to measure blood pressure in a calm state and take the average value of several measurements on different days and without medication to ensure the accuracy of the measurement. If there is any abnormality in blood pressure, it is recommended to consult a doctor promptly.