If you're 140/90 they call that high blood pressure, but that's not at a level where it's so high that it can't be corrected. Also the bottom number is more of an indicator than the top number. The bottom number is your pressure when your heart is at rest. The bottom number doesn't fluctuate nearly as much over time. If your top number is high just test again at a later date. 150/90 wouldn't scare me more than 140/90. I would just test again later.
However if that bottom number is bigger. More than likely you have been getting worse over time. Weather you get better or worse the top number will usually change first, then the bottom number will follow it in either direction.
High blood pressure kills you over time. It's not instant. If it kills you, you have had it for years.
Age does factor in to some degree