What age does perimenopause start

The normal range

Perimenopause commonly starts between about 40 and 47. It can begin in the late thirties and still be entirely normal.

Menopause itself, the point twelve months after your last period, most commonly happens between 45 and 55.

Duration varies as much as onset. Some women have a short transition of a year or two. Others have symptoms for a decade. The NHS notes that symptoms typically last seven to nine years overall.

Earlier than 45

Menopause before 45 is described as early. Before 40 it is premature ovarian insufficiency, and it is a different clinical situation rather than just an earlier version of the same one.

Premature ovarian insufficiency affects around 1 in 100 women under 40. It matters because losing oestrogen that young has longer-term consequences for bone density and cardiovascular health, and because treatment is generally recommended at least until the usual age of menopause rather than being weighed as optional.

If you are under 40 with menopausal symptoms, that warrants proper assessment and blood testing, which is one of the few situations where testing genuinely helps.

What shifts the timing

Several things are associated with earlier menopause:

• Smoking, consistently linked with menopause roughly one to two years earlier
• Family history, which is one of the stronger predictors: your mother's timing is informative
• Surgery to remove the ovaries, which causes immediate surgical menopause
• Chemotherapy or pelvic radiotherapy
• Some autoimmune conditions
• Certain genetic conditions

Hysterectomy without removing the ovaries stops periods but does not itself cause menopause, though it can bring it forward. It also removes your main signal, which makes symptoms the only guide.

Why "too young" is a bad answer

Being 41 does not rule out perimenopause. Being 38 does not either, though it raises the threshold for investigating properly rather than assuming.

If you have a cluster of symptoms and a changing cycle, your age is one piece of information among several, not a gate. Guidance recognises this explicitly: for women aged 40 to 45 with symptoms and cycle change, FSH testing has a role rather than being dismissed.

What if you are on contraception

Hormonal contraception can mask the picture entirely, because it controls your cycle and often suppresses the symptoms you would otherwise notice. Coming off it to find out is not always the right move, and there are ways to work around it. It is a conversation, not a dead end.

How to tell where you are

Age is context. What establishes the picture is your symptoms and what your cycle is doing, recorded properly, with other causes considered.

Our free assessment does that in about five minutes, and it takes your exact age into account rather than applying a rule of thumb.