Both elevated systolic and diastolic blood pressure increase the risk of cardiovascular disease, and therefore both must be treated to minimize the incidence of stroke and coronary heart disease. For coronary events, diastolic blood pressure has a higher predictive value than systolic blood pressure in younger age groups; in people over 50 years of age, systolic blood pressure begins to outperform diastolic blood pressure; as age increases further, systolic blood pressure increases further, while diastolic blood pressure tends to decrease.