Normal blood pressure values for people aged 40-50 years i.e. normal blood pressure criteria for adults. In general, the normal systolic blood pressure in a quiet state is 90-139mmHg, diastolic blood pressure is 60-89mmHg, and pulse pressure difference is 30-40mmHg. The upper limit of normal blood pressure is 140/90mmHg, which is also known as the critical value. It should be noted that blood pressure is easily affected by exercise, diet, mood, temperature and other factors fluctuate up and down, but as long as it is within the above range, it is considered normal and no need to worry. Generally speaking, hypertension can be diagnosed if the systolic blood pressure is greater than or equal to 140mmHg or the diastolic blood pressure is greater than or equal to 90mmHg when the blood pressure is measured by the same caregiver three times on non-simultaneous days and at the same time period, without the use of antihypertensive medication. If abnormal blood pressure is detected, it is recommended to consult a doctor as soon as possible to avoid delaying the condition.