Understanding Your Numbers

Normal Blood Pressure by Age: A UK Guide

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What the NHS considers normal, what the grades of hypertension actually mean, and why the idea that “high BP is fine when you’re older” is a myth worth retiring.

NK Medically reviewed by Dr. Nouman Kazmi, MBBS FCPS · 9 min read

120/80

Upper limit of normal (mmHg)

135/85

Home BP threshold (mmHg)

UK adults with undiagnosed hypertension

6–8w

For meaningful trends

Key Takeaways

Normal BP in the UK is 90/60–120/80 mmHg, regardless of age
High BP (hypertension) is diagnosed at 140/90 mmHg in clinic or 135/85 mmHg at home
The myth that “high BP at 70 is normal” is not supported by clinical evidence
BP typically rises with age due to vessel stiffening and other changes
Trends over 6–8 weeks matter more than a single reading
Approximately 5 million UK adults have undiagnosed hypertension

In This Article

Understanding blood pressure basics
What is normal blood pressure in the UK?
UK blood pressure categories
The age myth
Why BP rises with age
When should I see my GP?
The importance of consistent monitoring
Lifestyle changes that may help
Will my BP always be high now?
The bottom line

Understanding Blood Pressure Basics

Blood pressure is the force your blood exerts against the walls of your arteries as your heart pumps it around your body. It is recorded as two numbers, measured in millimetres of mercury (mmHg) — and understanding what each number means is the first step toward making sense of your readings.

The systolic number (the higher one) measures the pressure in your arteries when your heart contracts and pushes blood out. The diastolic number (the lower one) measures the pressure when your heart relaxes between beats. A reading of 120/80 mmHg means a systolic pressure of 120 and a diastolic pressure of 80.

Both numbers matter. A high systolic reading can indicate increased cardiovascular risk, particularly in people over 50, while a persistently elevated diastolic reading can signal problems with the smaller blood vessels. Your GP will look at both numbers together — along with the trend over time — to assess your cardiovascular health.

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Quick Reference

Think of systolic as the “push” pressure (heart pumping) and diastolic as the “rest” pressure (heart relaxing). A reading is always written as systolic/diastolic — for example, 120/80 mmHg.

What Is Normal Blood Pressure in the UK?

The NHS defines normal blood pressure as between 90/60 mmHg and 120/80 mmHg. This range applies to all adults, regardless of age. There is no separate “normal for your age” threshold in current UK clinical guidelines.

A reading consistently below 90/60 mmHg is considered low blood pressure (hypotension), which can cause symptoms like dizziness and fainting but is usually not dangerous unless accompanied by other medical conditions. A reading consistently above 120/80 mmHg places you in the elevated category, and above 140/90 mmHg at your GP surgery — or 135/85 mmHg at home — meets the diagnostic threshold for hypertension.

“The target is the same whether you are 45 or 75. What changes is how hard your body has to work to stay within it.”

— Adapted from NICE guideline NG136

It is worth noting that blood pressure fluctuates throughout the day. It tends to be lower when you first wake up, rises during periods of activity and stress, and falls again in the evening. A single reading is never the full picture — which is why both the NHS and NICE emphasise the importance of trends over time rather than reacting to any individual measurement.

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Monitoring Tip

Rather than worrying about a single reading, track your average over six to eight weeks. A consistent downward or upward trend tells you far more than any individual number. The Matter BP Tracker calculates rolling averages automatically so you can see the trend at a glance.

Approximately 5 million UK adults have undiagnosed hypertension. Many have no symptoms at all. High blood pressure is often called the “silent killer” because it can cause serious damage to your heart, brain, and kidneys without you feeling any different day to day.

UK Blood Pressure Categories

The UK uses specific thresholds — set by NICE — to categorise blood pressure. Importantly, the thresholds differ slightly between clinic readings and home readings, because people tend to have lower readings when they are relaxed at home.

Category	Clinic Reading	Home Reading
Normal	90/60–120/80 mmHg	90/60–120/80 mmHg
Elevated / Pre-hypertension	120/80–139/89 mmHg	120/80–134/84 mmHg
Grade 1 Hypertension	140/90–159/99 mmHg	135/85–149/94 mmHg
Grade 2 Hypertension	160/100+ mmHg	150/95+ mmHg
Severe / Stage 3	180/120+ mmHg	Seek urgent advice

If you record a reading of 180/120 mmHg or above, this is considered a hypertensive crisis. You should seek medical advice immediately, especially if you are experiencing symptoms such as severe headache, chest pain, breathlessness, or visual disturbance.

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Why Two Thresholds?

Home readings tend to run slightly lower than clinic readings because you are more relaxed in your own environment. That is why the home threshold for Grade 1 hypertension is 135/85 mmHg rather than 140/90 mmHg. Both are measuring the same clinical concern — just in different contexts.

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The Age Myth: “High BP Is Normal When You’re Older”

This is one of the most persistent and potentially dangerous misconceptions about blood pressure. The idea that “your blood pressure is supposed to go up as you get older” is not supported by current clinical evidence or NHS guidelines.

It is true that blood pressure tends to rise with age — we will cover the physiological reasons in the next section. But the fact that something is common does not make it normal or safe. The NHS uses the same diagnostic thresholds for a 45-year-old and a 75-year-old. If your reading is consistently above 140/90 mmHg in clinic (or 135/85 mmHg at home), it is classified as hypertension regardless of your age.

The risk of cardiovascular events — heart attack, stroke, kidney disease — actually increases with age, which makes it more important, not less, to manage blood pressure effectively in later life. Accepting a reading of 150/95 because “I’m 68, what do you expect?” is precisely the kind of reasoning that leaves serious risk unaddressed.

“A 75-year-old with a reading of 155/95 has Grade 1 hypertension, just as a 45-year-old would.”

— Based on NICE NG136 diagnostic thresholds

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The myth costs lives. The British Heart Foundation estimates that high blood pressure is a major contributor to approximately 75,000 deaths per year in the UK. Many of these are in people who assumed their elevated readings were “normal for their age” and did not seek treatment.

Why Blood Pressure Rises with Age

While the thresholds for healthy blood pressure do not change with age, the underlying physiology does. Understanding why blood pressure tends to rise can help you take more targeted action to manage it.

Arterial stiffening

As you age, the walls of your arteries gradually lose elasticity. Healthy arteries expand and contract with each heartbeat, absorbing the pulse of pressure. When they stiffen — a process called arteriosclerosis — the heart has to push harder to move blood through them. This primarily raises systolic pressure, which is why isolated systolic hypertension (high systolic but normal diastolic) becomes more common after 50.

Increased sodium sensitivity

The kidneys become less efficient at excreting sodium as you age. This means the same amount of dietary salt has a greater effect on blood pressure in a 65-year-old than it does in a 35-year-old. Reducing salt intake becomes increasingly important with age.

Hormonal changes

In women, the decline in oestrogen after menopause is associated with increased arterial stiffness and changes in how the body regulates fluid and salt. This partly explains why the prevalence of hypertension rises more steeply in women after their mid-50s. In men, gradual changes in the renin-angiotensin system — which regulates blood pressure — contribute to a steady increase over the decades.

Lifestyle accumulation

Decades of dietary habits, physical activity levels, weight changes, alcohol consumption, and stress all compound over time. The cardiovascular effects of these factors are cumulative. A body that has carried excess weight and eaten a high-sodium diet for 30 years faces different pressures than one that has not — regardless of genetics.

When Should I See My GP?

Home monitoring is valuable precisely because it gives you data you can act on. But knowing when to escalate is just as important as knowing how to measure.

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See your GP if:

Your home readings average above 135/85 mmHg over 7 or more days
A clinic reading is 140/90 mmHg or above
You record a reading of 180/120 mmHg or above — seek urgent medical advice the same day
You experience symptoms such as severe headache, chest pain, breathlessness, blurred vision, or nosebleeds alongside high readings
Your readings are fluctuating significantly from day to day without obvious cause
You are on blood pressure medication and your readings are changing unexpectedly

When you visit your GP, bring your home reading log with you. A structured record of readings taken over days or weeks is far more useful to your doctor than describing individual numbers from memory. If you use the Matter BP Tracker, you can export a clean PDF summary that shows your averages, trends, and individual readings — formatted for clinical review.

The Importance of Consistent Monitoring

Blood pressure is not a fixed number. It changes throughout the day, from hour to hour, and can be influenced by stress, food, caffeine, physical activity, and even the temperature of the room. A single reading — whether taken at home or in a GP surgery — is a snapshot, not a diagnosis.

NICE recommends that when confirming a hypertension diagnosis, patients should take two readings at least one minute apart, twice a day (morning and evening), for at least four days — and ideally seven. The first day’s readings should be discarded, as anxiety about the process often produces artificially high numbers.

“A single reading is a snapshot. A log built over six to eight weeks is the picture your GP needs.”

— Adapted from NICE guideline NG136

White coat hypertension

Some people consistently show higher readings in clinical settings than at home. This is known as white coat hypertension and affects an estimated 25% of people diagnosed with high blood pressure in a GP surgery. Home monitoring is the most practical way to identify this pattern and avoid unnecessary medication.

Masked hypertension

The opposite also exists. Some people have normal readings in clinic but elevated readings at home or during daily life. This is called masked hypertension and can only be detected through home monitoring or ambulatory blood pressure monitoring (ABPM). It carries the same cardiovascular risk as sustained hypertension.

Lifestyle Changes That May Help

Whether your blood pressure is slightly elevated or you have been diagnosed with hypertension, lifestyle changes are the foundation of management. In many cases, they can reduce blood pressure by a clinically meaningful amount — sometimes enough to delay or avoid medication entirely.

Reduce salt intake

The NHS recommends no more than 6g of salt per day (about one teaspoon). The average UK adult currently consumes around 8.1g. Most excess salt comes from processed foods, bread, cereals, and ready meals — not from the salt you add at the table. Reading labels and cooking from scratch more often can make a significant difference.

Move more

Aim for at least 150 minutes of moderate-intensity exercise per week — that is roughly 30 minutes on five days. Walking, cycling, swimming, and gardening all count. Regular physical activity strengthens the heart, improves arterial flexibility, and can lower systolic blood pressure by 5–8 mmHg.

Manage stress

Chronic stress contributes to sustained blood pressure elevation through the release of cortisol and adrenaline. While occasional stress is unavoidable, building regular recovery into your routine — whether through walking, breathing exercises, or simply protecting time for rest — can help prevent stress from becoming a chronic driver of high BP.

Limit alcohol

The NHS recommends no more than 14 units of alcohol per week, spread over three or more days. Regularly exceeding this increases your risk of sustained hypertension. Even moderate reductions in alcohol intake have been shown to lower blood pressure in people who currently drink above the recommended level.

Eat well

A diet rich in fruits, vegetables, whole grains, and lean protein — and low in saturated fat and processed food — supports healthy blood pressure. The DASH diet (Dietary Approaches to Stop Hypertension) is one of the most studied dietary patterns for blood pressure reduction, and its principles align closely with standard NHS dietary guidance.

Maintain a healthy weight

Carrying excess weight increases the workload on your heart and raises blood pressure. Losing even a modest amount of weight — 5–10% of your body weight — can produce a meaningful reduction in blood pressure, particularly if you are currently overweight or obese.

Prioritise sleep

Poor sleep quality and sleep disorders such as obstructive sleep apnoea are associated with elevated blood pressure. Aim for 7–9 hours of quality sleep per night. If you snore heavily, wake frequently, or feel unrested despite adequate sleep duration, consider discussing this with your GP.

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Where to Start

You do not need to overhaul everything at once. Pick one or two changes — such as a daily 20-minute walk and switching to reduced-salt bread — and build from there. Small, sustained changes tend to stick better than dramatic short-term efforts.

Will My Blood Pressure Always Be High Now?

Not necessarily. A diagnosis of hypertension does not mean your blood pressure is permanently fixed at an elevated level. In many cases — particularly Grade 1 hypertension without additional risk factors — lifestyle changes alone can bring readings back into the normal range.

The key variables are the ones within your control: diet, exercise, salt intake, alcohol consumption, weight, and stress management. Clinical trials have shown that structured lifestyle interventions can reduce systolic blood pressure by 10–15 mmHg — a reduction comparable to the effect of a single blood pressure medication.

If you are already on medication, lifestyle changes can improve how well the medication works and may, over time, allow your GP to reduce your dose. Any changes to medication should always be made in consultation with your doctor — never stop or adjust blood pressure medication on your own.

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Worth Knowing

Even small, sustained reductions in blood pressure can significantly lower your risk. A 5 mmHg reduction in systolic pressure is associated with roughly a 10% reduction in the risk of major cardiovascular events, according to a 2021 meta-analysis published in The Lancet.

The Bottom Line

Normal blood pressure in the UK is 90/60–120/80 mmHg, and that target does not change with age. Blood pressure may tend to rise as you get older, but rising does not mean acceptable. The same thresholds apply at 50 as they do at 70, and the consequences of unmanaged hypertension become more serious — not less — as you age.

If your readings are consistently above 135/85 mmHg at home, speak to your GP. If they are approaching that level, start monitoring regularly and look at the lifestyle factors you can control. The trend over weeks and months matters far more than any single reading — and building a clear record of your numbers is the best thing you can do for both yourself and your doctor.

Five million UK adults have undiagnosed high blood pressure. If you are reading this article, you are already ahead of most of them — because you are paying attention.

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References

NHS. High blood pressure (hypertension). Available at: nhs.uk
NICE. Hypertension in adults: diagnosis and management (NG136). Available at: nice.org.uk/guidance/ng136
British Heart Foundation. High blood pressure. Available at: bhf.org.uk
Blood Pressure UK. Know your numbers. Available at: bloodpressureuk.org
NHS England. Home blood pressure monitoring. Available at: england.nhs.uk
Rahimi K et al. Pharmacological blood pressure lowering for primary and secondary prevention of cardiovascular disease across different levels of blood pressure. The Lancet. 2021;397(10285):1625–1636. Available at: thelancet.com
Public Health England. Health matters: combating high blood pressure. Available at: gov.uk

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