Those Two Numbers on the Cuff — What Do They Mean?
Blood pressure gets reported as two numbers: systolic (top) and diastolic (bottom). Systolic measures the pressure when your heart squeezes. Diastolic measures the pressure between beats — when your heart’s resting.
A reading of 120/80 mmHg means your heart creates 120 millimeters of mercury pressure when it contracts and 80 mmHg when it relaxes. Both numbers matter, and both tend to shift as you age.
The AHA Categories (Updated in 2017)
The American Heart Association moved the goalposts in 2017, lowering the bar for what counts as hypertension. A lot of people who thought they were fine suddenly weren’t. Here are the current categories:
- Normal: Less than 120/80 mmHg
- Elevated: 120-129 / less than 80 mmHg
- Stage 1 Hypertension: 130-139 / 80-89 mmHg
- Stage 2 Hypertension: 140+ / 90+ mmHg
- Hypertensive Crisis: Over 180 / over 120 mmHg (get to an ER)
These categories apply to adults of all ages. There’s no official “adjusted normal” for older adults — though plenty of clinicians recognize that readings naturally creep up with aging.
What “Normal” Actually Looks Like at Different Ages
While the official guidelines don’t change by age, population studies show clear trends. Here’s what typical readings look like across age groups:
Men
- Ages 18-29: Average around 119/70 mmHg
- Ages 30-39: Average around 121/72 mmHg
- Ages 40-49: Average around 125/76 mmHg
- Ages 50-59: Average around 130/78 mmHg
- Ages 60-69: Average around 135/75 mmHg
- Ages 70+: Average around 139/72 mmHg
Women
- Ages 18-29: Average around 110/68 mmHg
- Ages 30-39: Average around 114/71 mmHg
- Ages 40-49: Average around 122/74 mmHg
- Ages 50-59: Average around 129/77 mmHg
- Ages 60-69: Average around 136/76 mmHg
- Ages 70+: Average around 140/73 mmHg
See how women tend to run lower than men until about age 60, when the gap closes? That’s likely because estrogen has a protective effect on blood vessels — and that protection fades after menopause.
Why Does Blood Pressure Climb With Age?
It’s common in industrialized societies, but it’s not truly inevitable. Several biological forces drive the trend:
Your Arteries Get Stiffer
Over time, artery walls lose their elasticity and become more rigid. This — called arteriosclerosis — means blood vessels can’t stretch as easily when the heart pumps, which pushes systolic pressure up. It’s also why systolic tends to keep climbing with age while diastolic may actually drop after 60.
Kidney Function Slows Down
Your kidneys help regulate blood pressure by managing fluid balance and sodium excretion. As kidney function gradually declines with age (a normal process), your body holds onto more sodium and fluid — and pressure goes up.
Hormones Shift
Declining estrogen after menopause, reduced nitric oxide production, and changes in the renin-angiotensin system all push blood pressure higher with age.
Decades of Lifestyle Add Up
Years of dietary sodium, sitting too much, gradual weight gain, and chronic stress create cumulative effects on your cardiovascular system. Populations that maintain traditional diets and stay physically active show much less age-related blood pressure increase. That tells you something.
How to Keep Your Numbers in Check — At Any Age
Lifestyle changes alone can lower blood pressure by 10 to 20 mmHg. That’s comparable to medication in many cases.
- Cut sodium to under 2,300 mg per day (ideally under 1,500 mg). Processed foods and restaurant meals are the worst offenders. Cooking at home with real ingredients is the single most impactful dietary change you can make.
- Try the DASH diet. The Dietary Approaches to Stop Hypertension plan loads up on fruits, vegetables, whole grains, and lean protein while cutting saturated fat and sodium. Clinical trials show it drops systolic pressure by 8 to 14 mmHg.
- Move your body 150 minutes per week. Brisk walking, cycling, swimming — moderate aerobic activity consistently lowers blood pressure. And the relationship is dose-dependent: more activity generally means lower numbers.
- Lose even a little weight. Dropping just 5 to 10 pounds can produce measurable reductions. Our Ideal Body Weight Calculator can help you set a realistic target.
- Go easy on alcohol. More than one drink daily for women or two for men raises blood pressure. Heavy drinking also undermines blood pressure medications.
- Deal with your stress. Chronic stress keeps cortisol and adrenaline elevated, which keeps pressure elevated too. Mindfulness, exercise, and decent sleep all help. Our Depression, Anxiety, and Stress Test can help you gauge where you are.
- Monitor at home — regularly. Home blood pressure monitors are cheap and accurate. Check at the same time each day, sit quietly for 5 minutes first, and keep your arm supported at heart level.
Understand Your Blood Pressure
Enter your latest reading to see where you fall on the AHA scale and get personalized guidance on next steps.
If your blood pressure is consistently running high, you may also want to check our Heart Disease Risk Calculator for a broader look at your cardiovascular health.
