My 16 year old went for a well visit and his blood pressure was 140/76. They didnt act concerned. I am a nurse and have taken it at home and also gotten 140/70. He says it makes him nervous. Other times his blood pressure is 110/ 60 or 100/70. He is thin and a swimmer.
140 is definitely high for that age. But many a time such high blood pressure noted just because of anxiety. Nervousness etc. So only thing to do is regularly check the blood pressure at holy environment. If it is persistently high in all the situation then only it is the matter of concern. Then consult physician.