110/100 = death. A "pulse pressure" (difference between the systolic and diastolic) of less than 16 usually results in a non-perfusable rhythm... meaning the heart cannot adequately fill and pump blood. This is one of the late signs of a cardiac tamponade (fluid around the heart, usually the result of trauma or malignancy).
Musclemom is right. I would be more worried about 110/95 than I would be 165/75.
In general, anyone with >160 systolic or >100 diastolic warrants immediate initiation of anti-hypertensive meds (according to JNC-7 guidelines). Even if it is white coat syndrome, these individuals likely become hypertensive with stressors encountered throughout the day. Therefore, they are likely to be hypertensive most of the day.
165/75 would make me wonder about aortic regurgitation. A widened pulse pressure is a sign of this (also referred to as aortic insufficiency). Of course this can be detected by simply placing a stethoscope on a chest. The worst case of this that I've seen as acute aortic regurgitation caused by damage to the aortic valve after a motor vehicle crash. The girl's blood pressure was 130/20. The intern had the nurse repeat it 5 times before anyone ever placed a stethoscope (and eventually an ultrasound probe) on the patient's chest.
Treat your blood pressure if it's high. Don't fall into the trap that you think you're not overweight, workout, etc. and cannot get high blood pressure. Genetics will conquer all and will make the most fit individuals have high cholesterol and high blood pressure. Being fit delayed the progression (and will slow it) for many years, but genetics still took its toll.
I know because I'm on blood pressure medicine. I have 8% bodyfat.