Well, the best scenario is the least likely to occur. Statistically there are individuals who never go to the doctor, don't know their blood pressure or cholesterol and eat fatty foods all day long and still live to be 100. Statistically this is a long shot and not something I would count on. It is far likelier that the individual who doesn't know his or her blood pressure or cholesterol is a ticking time bomb just waiting for a health problem that could have been prevented to occur. High cholesterol is treatable through diet, exercise, and medication.
High cholesterol contributes to heart disease and heart attack.
High blood pressure is treatable through diet, weight management, exercise, and medication. High blood pressure contributes to heart disease and also causes strokes or brain injuries. Or one day you are feeling a little tired, and the next day you are in the Coronary Care Unit on a monitor, waiting to see if you are stable enough for a heart by-pass or angioplasty. It's your call. In the arena of prospective medicine that I work in, predicting future health care needs based on current information about lifestyle and health, lack of knowledge of such valuable measurements as blood pressure and cholesterol are considered risk factors.