Blood pressure guidelines have shifted from the classic 120/80 mm Hg standard. Recent updates emphasize stricter targets to reduce risks of heart disease and stroke. Normal blood pressure is now defined as below 120/80, while 130-139/80-89 is considered Stage 1 Hypertension, and 140/90 or higher is Stage 2. For older adults or those with diabetes, the goal is often below 130/80. Previously, 139/89 was treated as prehypertension, but stricter guidelines now prioritize earlier intervention. These changes reflect growing evidence linking lower blood pressure with better long-term outcomes, though treatment plans should be tailored by healthcare professionals.