The typical picture
For most women the transition gets going somewhere in the 40s. Because it starts on average about four years before periods stop for good, and the average age for that is the early 50s, the mid-40s is where symptoms and cycle changes most often begin (Journal of Clinical Endocrinology & Metabolism, 2021). It is gradual rather than a switch, which is part of why it can be hard to date the start. It also moves through recognised stages of perimenopause, from the first cycle changes to the year after your final period.
| Milestone | Typical age |
|---|---|
| Perimenopause usually begins | Mid-40s, sometimes the late 30s or early 40s |
| Average age of the final period (menopause) | Around 51 |
| Early menopause, when the final period comes sooner | 40 to 45 |
| Premature ovarian insufficiency, worth proper assessment | Before 40 |
Typical, not fixed. Your own timing may be earlier or later, and that is normal.
Why the age varies so much
The timing of menopause, and so of the transition leading up to it, is influenced by a mix of factors, so a normal range spans several years on either side of the average (Journal of Clinical Endocrinology & Metabolism, 2021). Some women notice the first changes in their late 30s or early 40s, others not until their late 40s. Age on its own is only a rough guide. The clearer signals are your own: how your cycle is changing, and the symptoms you notice, including how many you have and how intense they are.
Earlier than usual, and when it matters
Two situations are treated differently. When the final period happens between 40 and 45, that is described as early menopause. When it happens before 40, it is called premature ovarian insufficiency, and it warrants proper assessment rather than being assumed (Journal of Clinical Endocrinology & Metabolism, 2021). This is why age changes the medical approach: symptoms that would be recognised clinically after 45 are worth investigating more fully when they appear earlier (NICE guideline NG23, 2024).
When to talk to a doctor
See your doctor if menopausal symptoms start before 45, if they are affecting your daily life, or if you are unsure whether what you are noticing fits the transition. Earlier symptoms in particular are worth a conversation rather than an assumption (NICE guideline NG23, 2024). anna does not diagnose, and this article is not medical advice.