What age does menopause start?

You want a number. Most pages will give you one — fifty-one — and leave it there, which is how you end up at forty-three convinced that what's happening to you can't be happening yet.

The average is real. It is also the least useful figure in this article, and it's worth understanding why before you measure yourself against it.

The short version

• The average age of menopause in the UK is 51.
• It usually happens between 45 and 55, and can be earlier.
• Menopause is a single point — twelve months after your last period. Everything leading up to it is perimenopause, and that starts years earlier.
• Before 45 is called early menopause. Before 40 is premature ovarian insufficiency, which affects around 1% of women.
• By 54, more than 80% of women have been through it.

The number everyone quotes

The average age for a woman in the UK to reach menopause is 51. NHS inform says so, the British Menopause Society says so, and NHS clinical guidance says so — with the important addition that it "can occur much earlier or later."

The usual range is 45 to 55.

That's the answer to the question as it's normally asked. But the way most of us use an average is to check whether we're normal, and for this particular number that doesn't work — because 51 is the midpoint of a ten-year spread, which means being years either side of it is not unusual at all. It's the range doing the work, not the average.

Why the average misleads

Two reasons, and the second one catches most people out.

First, menopause is one day, not a phase. It's diagnosed looking backwards: you've reached it when you've gone twelve months with no periods. Until that point you're in perimenopause. So "51" is not when things start happening to you. It's when they've finished happening.

Second, the symptoms come first — often by years. The British Menopause Society describes an early perimenopause, where the menstrual cycle starts changing, and a late perimenopause, where symptoms worsen and periods become infrequent. Both sit before the date you'd call your menopause.

Which is why a woman of 44 with disrupted sleep, a shortened cycle and a temper she doesn't recognise can be told she's "too young", and be perfectly on time. We've written separately about when perimenopause usually starts.

So what does "normal" actually cover?

By the age of 54, more than 80% of women have stopped having periods. That figure appears in both the British Menopause Society's clinical tool and NHS guidance, and it's more useful than the average, because it tells you about the spread rather than the middle.

Turn it around: roughly one in five women is still going at 54. If that's you, you are not an anomaly.

Early menopause: before 45

Menopause before the age of 45 is called early menopause.

It isn't rare enough to dismiss, and it matters clinically rather than just emotionally — oestrogen does work in the body beyond reproduction, particularly for bone and heart health, and a longer stretch without it is something a GP will want to know about and may want to treat.

If your periods have stopped or changed substantially and you're under 45, that is a reason to make an appointment rather than wait and see. What a GP does next depends on your age band, and we've set that out in can you test for perimenopause.

The earliest: premature ovarian insufficiency

Menopause before the age of 40 has its own name — premature ovarian insufficiency, usually shortened to POI.

The British Menopause Society's consensus statement, reviewed in March 2024, puts it at roughly 1% of women. Before the age of 30, the estimate drops to about 0.1%.

So it is uncommon. It is not vanishingly rare — one in a hundred is more women than most people assume, and they are frequently told they're too young for this to be what it is.

On cause, the honest answer is that usually there isn't one. The same consensus statement attributes 85–90% of cases to no identified cause. Of the rest: around 10–13% genetic, most often involving the X chromosome; roughly 5% autoimmune; and a further group caused by medical treatment — chemotherapy, radiotherapy or pelvic surgery. Smoking appears among the other contributors.

NHS inform makes the same point more briefly: premature or early menopause can happen at any age and in many cases there's no clear cause.

If you are under 40 and your periods have stopped or become infrequent, that is a see-someone situation and not a wait-and-see one. It is diagnosed carefully, and not on a single blood test.

What makes it happen earlier

The things with clear evidence behind them are mostly medical rather than lifestyle:

• Surgery that removes the ovaries — including some hysterectomies. This is immediate rather than gradual.
• Chemotherapy or radiotherapy.
• Smoking, which appears among the contributing causes in the POI consensus statement.

The British Menopause Society also notes that there are ethnic differences in the age of onset. It doesn't give figures, and I'm not going to invent any — but it's worth knowing that the 51 average is drawn across a population, and populations differ.

Beyond that, much of what circulates about predicting your own menopause age is less certain than it sounds. Where I can't source it, it isn't here.

When the age matters and when it doesn't

For most women over 45, the precise number is not the useful thing. What's useful is the pattern — what's changed, when it changed, and what your cycle has been doing alongside it.

Where age genuinely changes things is at the edges. Under 45, and especially under 40, your age changes what a GP does, what they test, and what they're likely to offer. That's the reason to mention it rather than assume you're too young.

The uncomfortable bit

A lot of women spend a year or two arguing with themselves about whether they're old enough for this, because a single number got quoted at them and it didn't match.

Fifty-one is where the middle of the distribution sits. It was never a threshold, and it was never a prediction about you.