The normal range of blood pressure for 40-year-old people is less than 120/80mmHg. Many 40-year-old people may gradually experience an increase in blood pressure due to long-term work pressure, mental stress, and irregular work and rest, and irregular diet, as long as the blood pressure is below 140/90mmHg, it is normal blood pressure, but between 120/80mmHg-140/90mmHg it belongs to the Higher values of normal blood pressure. For the high value of normal blood pressure, generally if the closer to 140/90mmHg, it means the more prehypertension is possible. For the age of 40 years old, must pay attention to adjust the lifestyle, prevent the increase of blood pressure, usually pay attention to light diet, quit smoking, limit the intake of alcohol, to regular exercise, do not sit for a long time, every day to adhere to about half an hour of moderate intensity exercise.