With a recent study showing people with blood pressure readings in the high-normal range have up to three times the risk for a heart attack as those with lower blood pressure, health care providers have more patients in their 40s watching their blood pressure readings. The high-normal range, called prehypertension, can potentially climb to more dangerous levels as people age without any symptoms, and most people are oblivious to the condition until they have a heart attack or stroke. This article is part of a Health By Decade special series in this week's Boston Globe Magazine.

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