riley,
There is no evidence that a diastolic of 60 is healthier than 70. There MIGHT be some evidence that 70 is healthier than 80. BUT that is a NATIVE 70, not a medicated one.
An UNMEDICATED 80 is probably FAR healthier than a MEDICATED 70.
In fact, as far as risk factors for hypertension go, one is considered a hypertensive if he is taking antihypertensive medication, no matter WHAT the numbers achieved.