You sit in the pharmacy, the cuff squeezes your arm, and the little screen flashes 138 over 86. Is that fine? Should you worry? The nurse says it is a bit high but do not panic, and you leave more confused than when you arrived.
Blood pressure numbers mean little without context, and normal shifts with age more than most people realise. Here is what does a normal blood pressure reading look like for my age, what the numbers actually mean, and when to act.
What does a Normal Blood Pressure Reading Look Like for my Age
For most adults, a normal reading is below 120/80 mmHg, with 120-139/80-89 considered elevated or high-normal depending on the guideline. Average blood pressure rises with age: a healthy 30-year-old might sit around 115/75, while a healthy 70-year-old often reads 135/85 without it signalling disease. The NHS generally treats sustained readings of 140/90 or above as high blood pressure (hypertension) warranting attention. What matters most is your sustained average over multiple readings, not any single number, and your overall cardiovascular risk rather than the reading in isolation.
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Understanding the two numbers
The top number, systolic, is the pressure when your heart beats and pushes blood out. The bottom number, diastolic, is the pressure between beats when the heart rests. Both matter, though systolic tends to drive risk assessment in older adults while diastolic gets more attention in younger people. Readings are measured in millimetres of mercury, mmHg, a unit inherited from old mercury instruments. A reading of 120/80 means 120 systolic over 80 diastolic. Either number being persistently high counts: isolated systolic hypertension, where only the top number is raised, is the commonest pattern in over-65s and still needs managing.
What is normal at your age
In your twenties and thirties, expect roughly 110-120 over 70-80; readings creeping above 130/85 deserve attention even if they do not yet meet hypertension thresholds. In your forties and fifties, averages drift up to around 120-135 over 75-85, partly because arteries stiffen with age. Past sixty, systolic readings of 130-140 are extremely common, and guidelines accept slightly higher targets for treatment in older adults to avoid over-medication and dizzy falls. These are population averages, not personal targets: a fit 65-year-old at 118/72 is doing brilliantly, while a 35-year-old at 145/95 needs action regardless of age. Children and teenagers have lower normal ranges that vary by height and age, which is why paediatric readings use centile charts.
- Sit quietly for 5 minutes before measuring; talking and rushing inflate readings.
- Support your back, keep feet flat, and rest your arm at heart level.
- Avoid caffeine, exercise and smoking for 30 minutes before a reading.
- Take 2 to 3 readings a minute apart and record the average.
- Use a validated upper-arm monitor, not a wrist device, for home tracking.
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White coat, masked and morning: why readings vary
Blood pressure is gloriously inconsistent, which is why one reading means little. White coat hypertension, where readings spike in clinical settings but are normal at home, affects up to a third of people and can lead to unnecessary treatment if nobody checks home readings. Masked hypertension is the reverse and more dangerous: normal in clinic, high in daily life, and easily missed. Blood pressure also follows a daily rhythm, usually lowest overnight, surging in the early morning, which is why heart attacks cluster in the morning hours. Home monitoring over a week, morning and evening, gives your GP far better data than a single surgery reading, and the NHS actively encourages it for diagnosis.
When high blood pressure needs treatment
UK guidance generally offers treatment for sustained readings at or above 140/90, or 135/85 on home monitoring, with lower thresholds if you have diabetes, kidney disease or established cardiovascular disease. But the decision is based on overall risk, not the number alone: your GP will calculate a QRISK score combining blood pressure with age, cholesterol, smoking and other factors. Lifestyle measures come first and genuinely work: losing weight, cutting salt below 6g a day, exercising regularly, limiting alcohol and stopping smoking can each shave meaningful points off. If medication is needed, modern blood pressure drugs are cheap, well tolerated and taken once daily; most people need only one or two tablets to reach target.
Low blood pressure: the under-discussed end
Readings below 90/60 can cause dizziness, fainting and fatigue, particularly on standing, though many people with naturally low readings feel perfectly fine and need no treatment. Postural hypotension, a drop on standing, becomes commoner with age and with certain medications, and it is a significant cause of falls in older adults. Simple measures help: rise slowly, stay hydrated, avoid large heavy meals and excess alcohol, and consider compression stockings if your GP suggests them. If dizziness is new, frequent or causing falls, get it checked, because medication doses sometimes need adjusting and occasionally it signals something else worth finding.
Home monitors: choosing and using one
A home blood pressure monitor is one of the best £25 investments in your health, provided you buy a validated upper-arm model from a reputable pharmacy rather than a novelty wrist gadget. Check validation lists from the British and Irish Hypertension Society before buying. Measure at the same times daily, seated and rested, and record a week’s readings to share with your GP; most surgeries accept a printed log or a photo of your notes. Bring the monitor to your appointment once a year so the nurse can check its accuracy against the surgery device. Consistent home readings transform hypertension from a guessing game into a managed number.
The NHS Live Well hub has practical, evidence-based tips on diet, exercise and everyday health.
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The bottom line
Normal blood pressure is under 120/80, averages rise with age, and 140/90 is the usual threshold for action in the UK. Judge by sustained averages from proper home monitoring, not single readings, and remember the number is one input into your overall risk. Lifestyle changes move the needle significantly, and modern treatment is simple and effective when needed. If you need a GP appointment, the NHS GP services guide explains how the system works.
