By 2050, older adults (aged ≥65 years) will number >1 billion worldwide, representing 15% of the global population.1 Despite the ubiquity of this aging phenomenon, there is often uncertainty in the clinical management of older adults, particularly with regard to intensity of therapy.2 Hypertension, defined as systolic BP (SBP) of ≥140 mm Hg or diastolic BP (DBP) of ≥90 mm Hg, is one such example. The optimal BP goal for older adults continues to be debated and its determination is a pressing need. 2,3 SBP tends to rise with age, and the prevalence of hypertension is 60% to 90% in older adults. 4,5 More than 60% of older people with hypertension have isolated systolic hypertension (ISH) 5,6 : elevated SBP but normal or even low DBP, as a consequence of reduced elasticity and compliance of large arteries and atherosclerosis. 6,7 Because ISH is associated with high risk for serious health problems, including coronary heart disease (CHD), stroke, heart failure, and kidney disease, [8][9][10] the urgency is greater than ever to determine on-treatment BP levels at which cardiovascular risks are minimized in older adults with ISH.Using data from the VALISH study (Valsartan in Elderly Isolated Systolic Hypertension), a randomized controlled trial designed to compare the effect of intensive (SBP target <140 mm Hg) versus moderate (≥140 and <150 mm Hg) SBP-lowering treatment on cardiovascular outcomes in older Japanese patients with ISH, 11,12 we sought to assess the Abstract-Our aim was to assess optimal on-treatment blood pressure (BP) at which cardiovascular disease (CVD) and all-cause mortality risks are minimized in Japanese older adults with isolated systolic hypertension. We used data from the VALISH study (Valsartan in Elderly Isolated Systolic Hypertension) that recruited older adults (n=3035; mean age, 76 years) with systolic BP (SBP) of ≥160 mm Hg and diastolic BP of <90 mm Hg. Patients were treated by valsartan.Patients were also categorized into 3 groups based on achieved on-treatment SBP of <130 mm Hg (n=317), 130 to <145 mm Hg (n=2025), or ≥145 mm Hg (n=693). The primary outcome was composite CVD (coronary heart disease, stroke, heart failure, cardiovascular deaths, other vascular diseases, and kidney diseases) with secondary outcome being all-cause mortality. Cox proportional hazards models were used to assess the CVD risk for each group. Over a median 3-year follow-up (8022 person-years), 93 CVD events and 52 deaths occurred. Using the on-treatment SBP of 130 to <145 mm Hg as reference stratum, the multivariable-adjusted hazard ratios and 95% confidence intervals of CVD and all-cause mortality risks for those with SBP<130 mm Hg were 2.08 (1.12-3.83) and 2.09 (0.93-4.71) and for those with SBP≥145 mm Hg were 2.29 (1.44-3.62) and 2.51 (1.35-4.66), respectively. On-treatment diastolic BP yielded no relationships with CVD or all-cause mortality risk. In conclusion, among Japanese older adults with isolated systolic hypertension, SBP in the range between 130 and 144 mm Hg was associated with minimal adverse ou...