What age does perimenopause start? (40s, 45, 30s)

What age does perimenopause start?

This is not medical advice — it is general information based on what you searched for that may help.

General information based on published sources and the symptoms you searched for. This isn't medical or legal advice, a diagnosis or a treatment plan. Please consult a doctor about your own symptoms. If your symptoms are severe or sudden, seek urgent care.

There's no single age that marks the start of perimenopause — it's defined by changes in your menstrual cycle, not a birthday. In the clinical STRAW+10 framework, the transition begins when your cycle lengths start varying by 7 days or more from one cycle to the next, whatever age that happens. See our stages of perimenopause guide for how that framework works.

That said, population data gives a useful sense of the typical range. A US national survey tracking women from 1959-1962 through 2015-2018 found the average age at natural menopause (the point when perimenopause ends) rose from 48.4 to 49.9 years over that 60-year period — a small but statistically significant increase, alongside a longer average reproductive life span (35.0 to 37.1 years). Since perimenopause typically lasts several years before that point, most women's first symptoms appear somewhere in their 40s.

Can perimenopause start earlier than that?

Yes, and it's not as rare as it might feel. The same study found that 11.8% of US women with natural menopause in the most recent survey period reported what the researchers defined as "early menopause" — natural menopause occurring between ages 40 and 45. For those women, the perimenopause years leading up to it would have started in their late 30s or early 40s.

If symptoms start well before 40, that's a different clinical picture — see our page on perimenopause in your 30s and our early menopause guide, since NICE guidance uses a different, lab-test-based diagnostic approach under age 40. See our companion page on the average age of menopause itself for how this age data extends past the perimenopause years.

How to check where you are

Use our interactive perimenopause stage guide to see how your cycle pattern and symptoms line up with clinical staging criteria.
Compare perimenopause vs. menopause to understand what each term actually means.
Track your symptoms with our symptoms checklist to bring a clear picture to your next appointment.

Based on my cycle changes and symptoms, does this look like a typical perimenopause pattern for my age, or should we investigate further?
Should we check anything else before assuming age alone explains what I'm experiencing?

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Questions people ask

What is the average age perimenopause starts?

There's no single fixed age, because perimenopause is defined by changes in your menstrual cycle, not a birthday. Most women notice the first signs in their mid-to-late 40s. A US national survey found the average age at natural menopause (the point perimenopause ends) was 49.9 years as of 2015-2018, up from 48.4 years in 1959-1962, so perimenopause for most women spans part of their 40s.

Is 40 too young for perimenopause?

No. Perimenopause commonly starts in the mid-to-late 40s, but it can start earlier. A national survey found 11.8% of women with natural menopause reported it happening between ages 40 and 45 ('early menopause' in that study's definition). If symptoms start well before 40, ask your clinician about premature ovarian insufficiency (POI), which has its own diagnostic criteria.