Blood Pressure by Age: What Changes and What Does Not

There is a persistent belief that blood pressure should rise with age and that a 70 year old with a reading of 150 over 85 is doing fine "for their age." The first half is a description of what happens. The second half is not what the evidence says. Here is what changes with age, what does not, and how to read your own number at any stage.

What changes

Systolic pressure rises. The top number climbs steadily from young adulthood through the 70s. The main cause is stiffening of the large arteries. A stiff aorta cannot absorb the pulse from each heartbeat, so the peak pressure goes up.

Diastolic pressure peaks then falls. The bottom number rises until about the mid 50s, then plateaus or drops. The same stiffening that raises systolic pressure lowers the pressure between beats.

Pulse pressure widens. The gap between the two numbers grows. A 30 year old might read 118 over 76, a gap of 42. A 75 year old might read 148 over 72, a gap of 76. Wide pulse pressure is itself a marker of arterial stiffness and cardiovascular risk.

Variability increases. Older adults show bigger swings between readings, more morning surges, and more drops after meals or on standing. A single reading becomes less representative. A seven day home average becomes more important.

The result is that isolated systolic hypertension, high top number with normal bottom number, is the dominant pattern after 60. It used to be dismissed as harmless aging. It is not. It carries the same stroke and heart attack risk as any other form.

What does not change

The categories. The American Heart Association thresholds apply to adults of all ages: normal under 120 over 80, elevated 120 to 129, stage 1 hypertension 130 to 139 or 80 to 89, stage 2 at 140 or 90 and above. There is no age adjusted "normal." See how to take blood pressure at home for the full table and technique.

The benefit of treatment. Trials in adults over 75, and some over 80, show that lowering systolic pressure reduces strokes, heart failure, and death. The SPRINT trial, which included many older adults, found benefit from a target under 120 in people who could tolerate it.

The target, mostly. Guidelines generally aim for under 130 over 80 for most adults who are treated, including older ones. Where they soften is not the number but the approach: in frail older adults, or those with many medications or a history of falls, clinicians go slower and watch for side effects. The target is individualized. The idea that the target should be higher simply because of a birth date is not supported.

The numbers by decade, roughly

These are population averages, not targets. They describe what happens to untreated adults in the US, not what should happen.

The point of the table is the last column. Hypertension is not an old age condition. It is common in the 30s and 40s, when it is least likely to be checked and most likely to do slow damage.

Special situations by age

Young adults with high readings. Under 40 with stage 2 hypertension, especially with no family history, a clinician will look for a secondary cause: kidney disease, adrenal conditions, sleep apnea, certain medications. Most cases are still primary hypertension, but the workup is worth doing once.

Pregnancy. Different thresholds apply. New hypertension after 20 weeks, or a reading of 140 over 90 with protein in urine, is evaluated for preeclampsia the same day. See protein in urine.

Older adults on treatment. The goal is the lowest pressure that does not cause dizziness on standing, falls, or kidney problems. Home monitoring, including a standing reading, is how that balance is found.

Anyone with diabetes or kidney disease. Targets are firmly under 130 over 80. Pressure control slows kidney decline more than almost anything else.

What to do at each stage

In your 20s and 30s: get a reading at every visit and know your number. If it is elevated, fix salt, weight, alcohol, and sleep now. It is far easier at 30 than at 55.

In your 40s and 50s: buy a validated home cuff and take a seven day average once or twice a year. This is the decade where most hypertension starts and goes unnoticed.

In your 60s and beyond: monitor at home on a schedule your clinician sets, include standing readings, and bring the log. Expect adjustments. The right dose changes as the body does.

At every age: the number is the number. "Normal for my age" is not a category on any chart.