Hypertension is common in the elderly with estimates of around 10-20% showing a sustained level of pressure, either systolic (greater-than-or-equal-to 160 mmHg), or diastolic (greater-than-or-equal-to 90 mmHg) or both. The benefits of treating subjects with raised diastolic pressure was shown by the trials of the European Working Party on High Blood Pressure in the Elderly (EWPHE), the Hypertension in Elderly Patients in Primary Care (HEP), and the Swedish Trial in Old patients with Hypertension (STOP-Hypertension). Evidence for the benefit of treating isolated systolic hypertension in the elderly was provided in one trial (SHEP: Systolic Hypertension in the Elderly Program), and the results of two others are awaited. However, it is important to provide data on all treatment effects, including adverse reactions as well as benefits. In addition to traditional measures of mortality, morbidity and side effects, the quality of life in patients on antihypertensive treatment should be considered. The methods of measuring quality of life in trials is discussed, and some results presented.