超过临界血压阈值就是高血压，不论年龄大小

A new study by investigators at Brigham and Women's Hospital, published in the journal of JAMA Cardiology, found that a systolic (top) blood pressure that regularly exceeds 120-125 mmHg could signal impending hypertension, regardless of age. These results are in line with the recently updated American College of Cardiology and American Heart Association high blood pressure guidelines, which categorize high blood pressure as greater than 130/80 mmHg.

Surpassing critical blood pressure threshold could signal hypertension regardless of age

https://medicalxpress.com/news/2018-03-surpassing-critical-blood-pressure-threshold.html

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Journal reference:  JAMA Cardiology