OK, this morning I was in WalMart bright and early (7am) and while shopping I decided to check out my BP and rate. I am now at 102 / 70 with a pulse of 57. I take that to be good. I know when I was in high school a couple of years ago it was like 90 / 55. Why is the my newer level considered to be better than my school days level, at least according to what I have been told?
When you take your blood pressure, no single reading can be used to indicate your real resting blood pressure. It will vary from day to day and minute to minute depending on your emotional state and level of activity. It someone had a single reading of a resting blood pressure … lets say….160/90, that would be a reason for concern especially if a second reading a few minutes later was just as high. It is much too high. Your numbers, both the 102/70 and the 90/55 are low, but do not indicate a condition that would need any treatment as long as you have no symptoms. When I say "resting blood pressure", I mean a reading taken when you have been seated, at rest for at least 10 minutes, with no stress or excitement, and you upper arm (where the BP cuff is placed) should be at the same level as your heart. Several readings taken throughout the day and then averaged will give you a reliable and much more accurate result than any single reading.

When you take your blood pressure, no single reading can be used to indicate your real resting blood pressure. It will vary from day to day and minute to minute depending on your emotional state and level of activity. It someone had a single reading of a resting blood pressure … lets say….160/90, that would be a reason for concern especially if a second reading a few minutes later was just as high. It is much too high. Your numbers, both the 102/70 and the 90/55 are low, but do not indicate a condition that would need any treatment as long as you have no symptoms. When I say "resting blood pressure", I mean a reading taken when you have been seated, at rest for at least 10 minutes, with no stress or excitement, and you upper arm (where the BP cuff is placed) should be at the same level as your heart. Several readings taken throughout the day and then averaged will give you a reliable and much more accurate result than any single reading.
References :
it can happen when you grow up, but check the correct bp with the help of a doctor and also with mercury manometer
References :
doc