A person's blood pressure (BP) changes throughout their life, and it is normal for it to fluctuate. Generally speaking, BP should fall within a range of normal values. In adults, a BP reading of 120/80 mmHg is considered to be "normal." However, if an individual's BP is slightly higher or lower than normal, it may not necessarily be a cause for concern.
At 30 years old, a BP of 150/90 mmHg is considered to be prehypertensive, which means it's higher than normal, but not yet high enough to be considered hypertension. Prehypertension is a warning sign that an individual is at an increased risk of developing hypertension, and it is recommended that they make lifestyle changes to lower their BP. This could include eating a healthier diet, getting regular physical activity, and maintaining a healthy weight.
It's important to note that a BP reading of 150/90 mmHg is only considered normal for some individuals. Everyone is different, and a person's BP can be affected by various factors, such as age, gender, and overall health. As such, it's important to speak with a doctor or healthcare provider to determine what is a normal BP range for you.