How Long Does Menopause Last, and How Do You Know You’ve Reached It?

If you are somewhere in your late forties or early fifties, there is a good chance you are counting months.

You know the date of your last period, possibly to the day. You’ve done the arithmetic more than once. Seven months. Nine months. Eleven and a half. And underneath the counting sits the question nobody quite says aloud: is it over yet? Have I reached it? Or is a period about to arrive and start the count again?

Women arrive in my therapy room with this question far more often than they arrive with hot flushes. So let me give you the plain answer first, and then let’s talk about the waiting itself, which is the part the answer doesn’t cover.

How long does menopause last? Strictly, one day. Menopause is the point twelve months after your final period, and the NHS puts the UK average age at 51, usually between 45 and 55. The years of changing symptoms before it are perimenopause, and the time after it is postmenopause, which lasts the rest of your life.

Menopause is technically one day

This surprises almost everyone. We use “menopause” for the whole stretch of changing years, but medically it is a single point in time, and it can only be identified looking backwards. You have gone twelve consecutive months without a period, so the last one you had is, in hindsight, declared your final one. That day was your menopause. Everything since has been postmenopause.

The years before it have a name. The long, uneven run-up, when hormones fluctuate and periods change rhythm, is perimenopause. It commonly lasts several years, and I’ve mapped it stage by stage in the four stages of perimenopause, so I won’t repeat that here.

The years after it have a name too. Once you’ve passed the twelve-month mark you are postmenopausal, and you stay that way. Symptoms don’t stop on the anniversary; for many women they carry on for a while and then ease, and I cover that separately in how long symptoms last after menopause. How all three phases fit together is laid out in the stages of menopause, the first article in this series.

What age does it happen?

The NHS gives the average age of menopause in the UK as 51, and says it usually happens between 45 and 55. Hold those figures loosely, because an average tells you very little about your own timing. Plenty of women reach it at 48, plenty at 54, and both are entirely ordinary.

Before 45 is different. Menopause between 40 and 45 is called early menopause, and before 40 it’s premature menopause, or premature ovarian insufficiency. Both deserve a proper conversation with your GP rather than a wait-and-see, and both carry their own emotional weight, which is why the next article in this series is devoted to them.

How do you know you’ve reached it?

Here is the part that most reassures the women I work with, because it removes a task they thought they had to complete.

If you’re over 45, there is no test to pass. The NICE guideline that UK GPs follow says that in women over 45, perimenopause and menopause should be diagnosed from symptoms and cycle changes alone, without a blood test. Hormone levels swing so widely during the transition that a single reading can easily mislead. The kits sold online measure follicle-stimulating hormone, FSH, and for the same reason tell you very little your own body hasn’t already.

If you’re under 45, do see your GP. Below that age, and particularly below 40, changes in your cycle deserve investigation, and blood tests may well be part of it. That isn’t cause for alarm; it’s simply the point at which your body’s timing is worth understanding properly.

The count itself is simple, and slightly brutal. Twelve months, no bleeding. If you bleed at month ten, the count starts again from that bleed, with no credit for the ten months before it. And once you’ve passed twelve months, any bleeding after that is postmenopausal bleeding, which the NHS says should always be checked by your GP rather than waited out. I cover that fully in bleeding after menopause.

Some women can’t count at all. If you use a hormonal coil, take a contraceptive pill, or have had a hysterectomy while keeping your ovaries, you may have no periods to count. You’re not excluded from menopause; you just can’t use the calendar to find it, and your GP can help you work out where you are from symptoms instead. And since the NHS is clear that you can still conceive during the transition, contraception stays a GP conversation until you’re safely past it.

I’m a counsellor, not a doctor, and none of this is medical advice. Tests, HRT and medication are always a conversation with your GP, and if that conversation feels daunting I’ve written about how to approach it.

The year of waiting

Now the part the leaflets leave out.

Twelve months is a long time to wait without knowing. For the whole of that year you are neither clearly in perimenopause nor clearly past it, and nothing you do can shorten it. There’s no diagnosis to hand people. There is only your say-so, and your say-so doesn’t feel like enough.

A woman I worked with kept a wall calendar for it. She crossed off each day, the way you might count down to a holiday, except the thing she was counting towards had no fixed date and could vanish overnight. At month nine she had a light bleed. What undid her wasn’t the bleed. It was taking the calendar down, and the shame she felt for grieving something as small as a restarted count. It wasn’t small. She had been counting towards an end point for nine months, after years of symptoms before that, and it had just been taken away from her.

Others dread the day itself. For all the talk of freedom, the twelfth month is also the point at which something is finally, unarguably over. More than one woman has told me she slowed her own counting towards the end, and stopped checking the date so closely, because not knowing for certain felt easier than knowing. That is not irrational; it is an ordinary response to a loss.

What helps in this year is not certainty, because there isn’t any. It’s company, and permission: to count if counting comforts you, to stop if it doesn’t, to feel relief and loss in the same afternoon, and to say “I don’t know if I’m there yet” without apology. The twelve months do pass, whether or not you count them.

What signals the end?

The only definitive sign is the calendar. Twelve months without a period is menopause; nothing else confirms it, and everything else is a pattern rather than proof.

Periods thin out, and symptoms often peak then soften. In the last stretch of perimenopause the gaps between periods grow to months and the bleeds are often lighter. Many women find flushes and night sweats are at their worst in the year or two around the final period and then, slowly and unevenly, ease. That’s a tendency, not a rule; if your symptoms carry on well past the twelve-month mark, you haven’t done anything wrong.

A quieter body. The women I work with often describe the end less as an event than as an absence: the tension of waiting for the next period fades, and one day they realise they stopped bracing weeks ago.

Frequently asked questions

What are the signs of the end of menopause?

Twelve consecutive months without a period is the only definitive sign that you have reached menopause. Before that point, the usual signals are periods becoming very infrequent and lighter, with gaps of several months, and, for many women, hot flushes and night sweats beginning to ease after peaking around the final period. Symptoms can continue for some time afterwards, so the end of bleeding and the end of symptoms are not always the same day.

What is the average age to finish menopause?

In the UK the average age of menopause is 51, according to the NHS, and it usually happens between 45 and 55. Because menopause is defined as the point twelve months after your final period, the average woman has her last period at around 50 and is confirmed as menopausal at around 51. Symptoms may carry on for a while after that, easing gradually, at a pace that varies widely from one woman to the next.

At what stage is menopause the worst?

For most women the hardest stretch is late perimenopause, the year or two either side of the final period, when oestrogen swings are at their widest and flushes, sleep disruption and mood changes tend to peak. That said, “worst” is personal. Some women find the early, undiagnosed years hardest because nobody has joined the dots yet. Symptoms generally ease in postmenopause, though not overnight, and not for everyone at the same rate.

How can I tell if I am starting menopause?

Look at two things together: your cycle and your symptoms. Periods that change length, flow or spacing, alongside new sleep problems, anxiety, flushes, brain fog or mood swings, usually mean the transition has begun. If you’re over 45, that pattern is enough for your GP to diagnose perimenopause under NICE guidance, with no blood test needed. Tracking your cycle for two or three months gives you and your GP a clearer picture.

How can I test myself for menopause?

Honestly, if you’re over 45, you don’t need to. NICE guidance says diagnosis in that age group is based on symptoms and cycle changes, not tests, because hormone levels fluctuate too much to be reliable. Home kits measure FSH and are subject to the same problem. If you’re under 45, and especially under 40, please don’t self-test; see your GP, who can arrange proper blood tests and investigate whether early or premature menopause is a factor.

I’ve sat with many women through the long year of waiting, and through the years that follow it. If you’d like company for yours, book a free discovery call here. Next in the series: Early, Premature and Surgical Menopause: When It Comes Before You’re Ready.

This article is part of The Menopause Journey, an eight-part series.
Previous: part 1 · Next: part 3