Normal blood pressure in 80-90 year olds should be <150/90mmHg and pulse pressure should be 20-40mmHg. The normal value of blood pressure is not related to age, 80~90 years old people may have blood pressure slightly higher than normal adults, generally need to meet the normal reference value, i.e. <140/90mmHg. However, due to atherosclerosis in the elderly, the normal range of systolic blood pressure can be relaxed to <150mmHg, and the pulse pressure is the difference between systolic blood pressure and diastolic blood pressure, and it should be in the range of 20~40mmHg. Generally, 3 measurements of office blood pressure ≥140/90mmHg on a non-same day is considered hypertension, so the upper limit of the normal blood pressure range for office measurements is 140/90mmHg. Hypertension can also be referred to home self-measurement of blood pressure ≥135/85mmHg, and the upper limit of home self-measurement of blood pressure should be <135/85mmHg. Normal blood pressure range, if the blood pressure <120/80mmHg for normal blood pressure, blood pressure ≥ 120/80mmHg for normal high value blood pressure, the latter development of hypertension increased likelihood. Too low blood pressure is also detrimental to health. Blood pressure <90/60mmHg is generally considered to be hypotensive, but some long and thin and women have blood pressure <90/60mmHg for a long time without abnormal symptoms. To determine whether a blood pressure <90/60mmHg is abnormal or not, it is still necessary to combine with other clinical data, so it is difficult to define the lower limit of normal blood pressure. It is recommended that 80-90 year olds should have their blood pressure measured regularly, and if they have abnormal blood pressure, they should have their blood pressure retested and consult a doctor promptly.