16 year old male, 120 lbs with 115/99 bp normal?

Hi! I have been researching this and seem to have a lot of conflicting data coming across my computer screen. I have had my son's blood pressure checked several times this past week and it is reading 115/99 (on average, it seems to be staying pretty steady at that level.) Is this normal? He is 5'10", 120-125 pounds(we tend to have very thin men in our family)He doesn't smoke or take any drugs - he was on Clonodine for awhile - but not for blood pressure, for Tourette Syndrome. He had a normal bp rate when he began taking it. He has not taken it in a year because it made him aggressive(he is normally very sweet). I mention this because I don't know if there could be a correlation between the two for some strange reason. Also, to make note he does normally eat pretty healthy - but the school lunches he has been getting seem less than stellar,lots of greasy food. He walks about a mile a day, but once he gets home he becomes a couch potato or plays either video or card games with his friends. So, perhaps not quite enough exorcise? Anyway...I do plan to schedule an appointment with his normal doctor, however, I will worry myself sick until then....am I overreacting? Is this normal for someone his size or should I be concerned. Thanks in advance for your help...and your patience with me since this may have come off a bit all over the place.